update build

13 files changed, 1686 insertions, 2591 deletions

diff --git a/build/CHANGELOG.md b/build/CHANGELOG.md
index 0f28c92..f15e081 100644
--- a/build/CHANGELOG.md
+++ b/build/CHANGELOG.md
@@ -1,6 +1,14 @@
+# v1.5.2
+- Allow using `"consructor"` as an argument in `memoize` (#998)
+- Give a better error messsage when `auto` dependency checking fails (#994)
+- Various doc updates (#936, #956, #979, #1002)
+
 # v1.5.1
 - Fix issue with `pause` in `queue` with concurrency enabled (#946)
 - `while` and `until` now pass the final result to callback (#963)
+- `auto` will properly handle concurrency when there is no callback (#966)
+- `auto` will now  properly stop execution when an error occurs (#988, #993)
+- Various doc fixes (#971, #980)
 
 # v1.5.0
 
diff --git a/build/LICENSE b/build/LICENSE
index 8f29698..9fe85b9 100644
--- a/build/LICENSE
+++ b/build/LICENSE
@@ -1,4 +1,4 @@
-Copyright (c) 2010-2014 Caolan McMahon
+Copyright (c) 2010-2016 Caolan McMahon
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/build/README.md b/build/README.md
index 0ec79c1..9cbf29e 100644
--- a/build/README.md
+++ b/build/README.md
@@ -1,3 +1,5 @@
+**NOTE: This is the README for Async 2.0, currently under development.  For docs for async@1.5.2 go [HERE](https://github.com/caolan/async/blob/v1.5.2/README.md).
+
 # Async.js
 
 [![Build Status via Travis CI](https://travis-ci.org/caolan/async.svg?branch=master)](https://travis-ci.org/caolan/async)
@@ -14,8 +16,7 @@ it can also be used directly in the browser.
 Async is also installable via:
 
 - [bower](http://bower.io/): `bower install async`
-- [component](https://github.com/component/component): `component install
-  caolan/async`
+- [component](https://github.com/component/component): `component install caolan/async`
 - [jam](http://jamjs.org/): `jam install async`
 - [spm](http://spmjs.io/): `spm install async`
 
@@ -28,7 +29,7 @@ callback as the last argument of your `async` function.
 
 ## Quick Examples
 
-```javascript
+```js
 async.map(['file1','file2','file3'], fs.stat, function(err, results){
     // results is now an array of stats for each file
 });
@@ -55,33 +56,33 @@ missing please create a GitHub issue for it.
 ## Common Pitfalls <sub>[(StackOverflow)](http://stackoverflow.com/questions/tagged/async.js)</sub>
 ### Synchronous iteration functions
 
-If you get an error like `RangeError: Maximum call stack size exceeded.` or other stack overflow issues when using async, you are likely using a synchronous iterator.  By *synchronous* we mean a function that calls its callback on the same tick in the javascript event loop, without doing any I/O or using any timers.  Calling many callbacks iteratively will quickly overflow the stack. If you run into this issue, just defer your callback with `async.setImmediate` to start a new call stack on the next tick of the event loop.
+If you get an error like `RangeError: Maximum call stack size exceeded.` or other stack overflow issues when using async, you are likely using a synchronous iteratee.  By *synchronous* we mean a function that calls its callback on the same tick in the javascript event loop, without doing any I/O or using any timers.  Calling many callbacks iteratively will quickly overflow the stack. If you run into this issue, just defer your callback with `async.setImmediate` to start a new call stack on the next tick of the event loop.
 
 This can also arise by accident if you callback early in certain cases:
 
 ```js
-async.eachSeries(hugeArray, function iterator(item, callback) {
-  if (inCache(item)) {
-    callback(null, cache[item]); // if many items are cached, you'll overflow
-  } else {
-    doSomeIO(item, callback);
-  }
+async.eachSeries(hugeArray, function iteratee(item, callback) {
+    if (inCache(item)) {
+        callback(null, cache[item]); // if many items are cached, you'll overflow
+    } else {
+        doSomeIO(item, callback);
+    }
 }, function done() {
-  //...
+    //...
 });
 ```
 
 Just change it to:
 
 ```js
-async.eachSeries(hugeArray, function iterator(item, callback) {
-  if (inCache(item)) {
-    async.setImmediate(function () {
-      callback(null, cache[item]);
-    });
-  } else {
-    doSomeIO(item, callback);
-  //...
+async.eachSeries(hugeArray, function iteratee(item, callback) {
+    if (inCache(item)) {
+        async.setImmediate(function () {
+            callback(null, cache[item]);
+        });
+    } else {
+        doSomeIO(item, callback);
+    //...
 ```
 
 Async guards against synchronous functions in some, but not all, cases.  If you are still running into stack overflows, you can defer as suggested above, or wrap functions with [`async.ensureAsync`](#ensureAsync)  Functions that are asynchronous by their nature do not have this problem and don't need the extra callback deferral.
@@ -97,13 +98,13 @@ Make sure to always `return` when calling a callback early, otherwise you will c
 async.waterfall([
     function (callback) {
         getSomething(options, function (err, result) {
-          if (err) {
-            callback(new Error("failed getting something:" + err.message));
-            // we should return here
-          }
-          // since we did not return, this callback still will be called and
-          // `processData` will be called twice
-          callback(null, result);
+            if (err) {
+                callback(new Error("failed getting something:" + err.message));
+                // we should return here
+            }
+            // since we did not return, this callback still will be called and
+            // `processData` will be called twice
+            callback(null, result);
         });
     },
     processData
@@ -113,37 +114,37 @@ async.waterfall([
 It is always good practice to `return callback(err, result)`  whenever a callback call is not the last statement of a function.
 
 
-### Binding a context to an iterator
+### Binding a context to an iteratee
 
 This section is really about `bind`, not about `async`. If you are wondering how to
-make `async` execute your iterators in a given context, or are confused as to why
-a method of another library isn't working as an iterator, study this example:
+make `async` execute your iteratees in a given context, or are confused as to why
+a method of another library isn't working as an iteratee, study this example:
 
 ```js
 // Here is a simple object with an (unnecessarily roundabout) squaring method
 var AsyncSquaringLibrary = {
-  squareExponent: 2,
-  square: function(number, callback){
-    var result = Math.pow(number, this.squareExponent);
-    setTimeout(function(){
-      callback(null, result);
-    }, 200);
-  }
+    squareExponent: 2,
+    square: function(number, callback){
+        var result = Math.pow(number, this.squareExponent);
+        setTimeout(function(){
+            callback(null, result);
+        }, 200);
+    }
 };
 
 async.map([1, 2, 3], AsyncSquaringLibrary.square, function(err, result){
-  // result is [NaN, NaN, NaN]
-  // This fails because the `this.squareExponent` expression in the square
-  // function is not evaluated in the context of AsyncSquaringLibrary, and is
-  // therefore undefined.
+    // result is [NaN, NaN, NaN]
+    // This fails because the `this.squareExponent` expression in the square
+    // function is not evaluated in the context of AsyncSquaringLibrary, and is
+    // therefore undefined.
 });
 
 async.map([1, 2, 3], AsyncSquaringLibrary.square.bind(AsyncSquaringLibrary), function(err, result){
-  // result is [1, 4, 9]
-  // With the help of bind we can attach a context to the iterator before
-  // passing it to async. Now the square function will be executed in its
-  // 'home' AsyncSquaringLibrary context and the value of `this.squareExponent`
-  // will be as expected.
+    // result is [1, 4, 9]
+    // With the help of bind we can attach a context to the iteratee before
+    // passing it to async. Now the square function will be executed in its
+    // 'home' AsyncSquaringLibrary context and the value of `this.squareExponent`
+    // will be as expected.
 });
 ```
 
@@ -233,27 +234,27 @@ Some functions are also available in the following forms:
 
 ## Collections
 
-<a name="forEach" />
-<a name="each" />
-### each(arr, iterator, [callback])
+<a name="forEach"></a>
+<a name="each"></a>
+### each(arr, iteratee, [callback])
 
-Applies the function `iterator` to each item in `arr`, in parallel.
-The `iterator` is called with an item from the list, and a callback for when it
-has finished. If the `iterator` passes an error to its `callback`, the main
+Applies the function `iteratee` to each item in `arr`, in parallel.
+The `iteratee` is called with an item from the list, and a callback for when it
+has finished. If the `iteratee` passes an error to its `callback`, the main
 `callback` (for the `each` function) is immediately called with the error.
 
-Note, that since this function applies `iterator` to each item in parallel,
-there is no guarantee that the iterator functions will complete in order.
+Note, that since this function applies `iteratee` to each item in parallel,
+there is no guarantee that the iteratee functions will complete in order.
 
 __Arguments__
 
 * `arr` - An array to iterate over.
-* `iterator(item, callback)` - A function to apply to each item in `arr`.
-  The iterator is passed a `callback(err)` which must be called once it has
+* `iteratee(item, callback)` - A function to apply to each item in `arr`.
+  The iteratee is passed a `callback(err)` which must be called once it has
   completed. If no error has occurred, the `callback` should be run without
   arguments or with an explicit `null` argument.  The array index is not passed
-  to the iterator.  If you need the index, use [`forEachOf`](#forEachOf).
-* `callback(err)` - *Optional* A callback which is called when all `iterator` functions
+  to the iteratee.  If you need the index, use [`forEachOf`](#forEachOf).
+* `callback(err)` - *Optional* A callback which is called when all `iteratee` functions
   have finished, or an error occurs.
 
 __Examples__
@@ -298,27 +299,26 @@ async.each(openFiles, function(file, callback) {
 
 __Related__
 
-* eachSeries(arr, iterator, [callback])
-* eachLimit(arr, limit, iterator, [callback])
+* eachSeries(arr, iteratee, [callback])
+* eachLimit(arr, limit, iteratee, [callback])
 
 ---------------------------------------
 
-<a name="forEachOf" />
-<a name="eachOf" />
-
-### forEachOf(obj, iterator, [callback])
+<a name="forEachOf"></a>
+<a name="eachOf"></a>
+### forEachOf(obj, iteratee, [callback])
 
-Like `each`, except that it iterates over objects, and passes the key as the second argument to the iterator.
+Like `each`, except that it iterates over objects, and passes the key as the second argument to the iteratee.
 
 __Arguments__
 
 * `obj` - An object or array to iterate over.
-* `iterator(item, key, callback)` - A function to apply to each item in `obj`.
-The `key` is the item's key, or index in the case of an array. The iterator is
+* `iteratee(item, key, callback)` - A function to apply to each item in `obj`.
+The `key` is the item's key, or index in the case of an array. The iteratee is
 passed a `callback(err)` which must be called once it has completed. If no
 error has occurred, the callback should be run without arguments or with an
 explicit `null` argument.
-* `callback(err)` - *Optional* A callback which is called when all `iterator` functions have finished, or an error occurs.
+* `callback(err)` - *Optional* A callback which is called when all `iteratee` functions have finished, or an error occurs.
 
 __Example__
 
@@ -327,49 +327,49 @@ var obj = {dev: "/dev.json", test: "/test.json", prod: "/prod.json"};
 var configs = {};
 
 async.forEachOf(obj, function (value, key, callback) {
-  fs.readFile(__dirname + value, "utf8", function (err, data) {
-    if (err) return callback(err);
-    try {
-      configs[key] = JSON.parse(data);
-    } catch (e) {
-      return callback(e);
-    }
-    callback();
-  })
+    fs.readFile(__dirname + value, "utf8", function (err, data) {
+        if (err) return callback(err);
+        try {
+            configs[key] = JSON.parse(data);
+        } catch (e) {
+            return callback(e);
+        }
+        callback();
+    });
 }, function (err) {
-  if (err) console.error(err.message);
-  // configs is now a map of JSON data
-  doSomethingWith(configs);
+    if (err) console.error(err.message);
+    // configs is now a map of JSON data
+    doSomethingWith(configs);
 })
 ```
 
 __Related__
 
-* forEachOfSeries(obj, iterator, [callback])
-* forEachOfLimit(obj, limit, iterator, [callback])
+* forEachOfSeries(obj, iteratee, [callback])
+* forEachOfLimit(obj, limit, iteratee, [callback])
 
 ---------------------------------------
 
-<a name="map" />
-### map(arr, iterator, [callback])
+<a name="map"></a>
+### map(arr, iteratee, [callback])
 
 Produces a new array of values by mapping each value in `arr` through
-the `iterator` function. The `iterator` is called with an item from `arr` and a
+the `iteratee` function. The `iteratee` is called with an item from `arr` and a
 callback for when it has finished processing. Each of these callback takes 2 arguments:
-an `error`, and the transformed item from `arr`. If `iterator` passes an error to its
+an `error`, and the transformed item from `arr`. If `iteratee` passes an error to its
 callback, the main `callback` (for the `map` function) is immediately called with the error.
 
-Note, that since this function applies the `iterator` to each item in parallel,
-there is no guarantee that the `iterator` functions will complete in order.
+Note, that since this function applies the `iteratee` to each item in parallel,
+there is no guarantee that the `iteratee` functions will complete in order.
 However, the results array will be in the same order as the original `arr`.
 
 __Arguments__
 
 * `arr` - An array to iterate over.
-* `iterator(item, callback)` - A function to apply to each item in `arr`.
-  The iterator is passed a `callback(err, transformed)` which must be called once
+* `iteratee(item, callback)` - A function to apply to each item in `arr`.
+  The iteratee is passed a `callback(err, transformed)` which must be called once
   it has completed with an error (which can be `null`) and a transformed item.
-* `callback(err, results)` - *Optional* A callback which is called when all `iterator`
+* `callback(err, results)` - *Optional* A callback which is called when all `iteratee`
   functions have finished, or an error occurs. Results is an array of the
   transformed items from the `arr`.
 
@@ -382,19 +382,20 @@ async.map(['file1','file2','file3'], fs.stat, function(err, results){
 ```
 
 __Related__
-* mapSeries(arr, iterator, [callback])
-* mapLimit(arr, limit, iterator, [callback])
+
+* mapSeries(arr, iteratee, [callback])
+* mapLimit(arr, limit, iteratee, [callback])
 
 ---------------------------------------
 
-<a name="select" />
-<a name="filter" />
-### filter(arr, iterator, [callback])
+<a name="select"></a>
+<a name="filter"></a>
+### filter(arr, iteratee, [callback])
 
 __Alias:__ `select`
 
 Returns a new array of all the values in `arr` which pass an async truth test.
-_The callback for each `iterator` call only accepts a single argument of `true` or
+_The callback for each `iteratee` call only accepts a single argument of `true` or
 `false`; it does not accept an error argument first!_ This is in-line with the
 way node libraries work with truth tests like `fs.exists`. This operation is
 performed in parallel, but the results array will be in the same order as the
@@ -403,10 +404,10 @@ original.
 __Arguments__
 
 * `arr` - An array to iterate over.
-* `iterator(item, callback)` - A truth test to apply to each item in `arr`.
-  The `iterator` is passed a `callback(truthValue)`, which must be called with a
+* `iteratee(item, callback)` - A truth test to apply to each item in `arr`.
+  The `iteratee` is passed a `callback(truthValue)`, which must be called with a
   boolean argument once it has completed.
-* `callback(results)` - *Optional* A callback which is called after all the `iterator`
+* `callback(results)` - *Optional* A callback which is called after all the `iteratee`
   functions have finished.
 
 __Example__
@@ -419,29 +420,29 @@ async.filter(['file1','file2','file3'], fs.exists, function(results){
 
 __Related__
 
-* filterSeries(arr, iterator, [callback])
-* filterLimit(arr, limit, iterator, [callback])
+* filterSeries(arr, iteratee, [callback])
+* filterLimit(arr, limit, iteratee, [callback])
 
 ---------------------------------------
 
-<a name="reject" />
-### reject(arr, iterator, [callback])
+<a name="reject"></a>
+### reject(arr, iteratee, [callback])
 
 The opposite of [`filter`](#filter). Removes values that pass an `async` truth test.
 
 __Related__
 
-* rejectSeries(arr, iterator, [callback])
-* rejectLimit(arr, limit, iterator, [callback])
+* rejectSeries(arr, iteratee, [callback])
+* rejectLimit(arr, limit, iteratee, [callback])
 
 ---------------------------------------
 
-<a name="reduce" />
-### reduce(arr, memo, iterator, [callback])
+<a name="reduce"></a>
+### reduce(arr, memo, iteratee, [callback])
 
 __Aliases:__ `inject`, `foldl`
 
-Reduces `arr` into a single value using an async `iterator` to return
+Reduces `arr` into a single value using an async `iteratee` to return
 each successive step. `memo` is the initial state of the reduction.
 This function only operates in series.
 
@@ -454,13 +455,13 @@ __Arguments__
 
 * `arr` - An array to iterate over.
 * `memo` - The initial state of the reduction.
-* `iterator(memo, item, callback)` - A function applied to each item in the
-  array to produce the next step in the reduction. The `iterator` is passed a
+* `iteratee(memo, item, callback)` - A function applied to each item in the
+  array to produce the next step in the reduction. The `iteratee` is passed a
   `callback(err, reduction)` which accepts an optional error as its first
   argument, and the state of the reduction as the second. If an error is
   passed to the callback, the reduction is stopped and the main `callback` is
   immediately called with the error.
-* `callback(err, result)` - *Optional* A callback which is called after all the `iterator`
+* `callback(err, result)` - *Optional* A callback which is called after all the `iteratee`
   functions have finished. Result is the reduced value.
 
 __Example__
@@ -478,35 +479,34 @@ async.reduce([1,2,3], 0, function(memo, item, callback){
 
 ---------------------------------------
 
-<a name="reduceRight" />
-### reduceRight(arr, memo, iterator, [callback])
+<a name="reduceRight"></a>
+### reduceRight(arr, memo, iteratee, [callback])
 
 __Alias:__ `foldr`
 
 Same as [`reduce`](#reduce), only operates on `arr` in reverse order.
 
-
 ---------------------------------------
 
-<a name="detect" />
-### detect(arr, iterator, [callback])
+<a name="detect"></a>
+### detect(arr, iteratee, [callback])
 
 Returns the first value in `arr` that passes an async truth test. The
-`iterator` is applied in parallel, meaning the first iterator to return `true` will
+`iteratee` is applied in parallel, meaning the first iteratee to return `true` will
 fire the detect `callback` with that result. That means the result might not be
 the first item in the original `arr` (in terms of order) that passes the test.
 
-If order within the original `arr` is important, then look at [`detectSeries`](#detectSeries).
+If order within the original `arr` is important, then look at `detectSeries`.
 
 __Arguments__
 
 * `arr` - An array to iterate over.
-* `iterator(item, callback)` - A truth test to apply to each item in `arr`.
-  The iterator is passed a `callback(truthValue)` which must be called with a
+* `iteratee(item, callback)` - A truth test to apply to each item in `arr`.
+  The iteratee is passed a `callback(truthValue)` which must be called with a
   boolean argument once it has completed. **Note: this callback does not take an error as its first argument.**
-* `callback(result)` - *Optional* A callback which is called as soon as any iterator returns
-  `true`, or after all the `iterator` functions have finished. Result will be
-  the first item in the array that passes the truth test (iterator) or the
+* `callback(result)` - *Optional* A callback which is called as soon as any iteratee returns
+  `true`, or after all the `iteratee` functions have finished. Result will be
+  the first item in the array that passes the truth test (iteratee) or the
   value `undefined` if none passed.  **Note: this callback does not take an error as its first argument.**
 
 __Example__
@@ -519,26 +519,26 @@ async.detect(['file1','file2','file3'], fs.exists, function(result){
 
 __Related__
 
-* detectSeries(arr, iterator, [callback])
-* detectLimit(arr, limit, iterator, [callback])
+* detectSeries(arr, iteratee, [callback])
+* detectLimit(arr, limit, iteratee, [callback])
 
 ---------------------------------------
 
-<a name="sortBy" />
-### sortBy(arr, iterator, [callback])
+<a name="sortBy"></a>
+### sortBy(arr, iteratee, [callback])
 
-Sorts a list by the results of running each `arr` value through an async `iterator`.
+Sorts a list by the results of running each `arr` value through an async `iteratee`.
 
 __Arguments__
 
 * `arr` - An array to iterate over.
-* `iterator(item, callback)` - A function to apply to each item in `arr`.
-  The iterator is passed a `callback(err, sortValue)` which must be called once it
+* `iteratee(item, callback)` - A function to apply to each item in `arr`.
+  The iteratee is passed a `callback(err, sortValue)` which must be called once it
   has completed with an error (which can be `null`) and a value to use as the sort
   criteria.
-* `callback(err, results)` - *Optional* A callback which is called after all the `iterator`
+* `callback(err, results)` - *Optional* A callback which is called after all the `iteratee`
   functions have finished, or an error occurs. Results is the items from
-  the original `arr` sorted by the values returned by the `iterator` calls.
+  the original `arr` sorted by the values returned by the `iteratee` calls.
 
 __Example__
 
@@ -575,25 +575,25 @@ async.sortBy([1,9,3,5], function(x, callback){
 
 ---------------------------------------
 
-<a name="some" />
-### some(arr, iterator, [callback])
+<a name="some"></a>
+### some(arr, iteratee, [callback])
 
 __Alias:__ `any`
 
 Returns `true` if at least one element in the `arr` satisfies an async test.
-_The callback for each iterator call only accepts a single argument of `true` or
+_The callback for each iteratee call only accepts a single argument of `true` or
 `false`; it does not accept an error argument first!_ This is in-line with the
-way node libraries work with truth tests like `fs.exists`. Once any iterator
+way node libraries work with truth tests like `fs.exists`. Once any iteratee
 call returns `true`, the main `callback` is immediately called.
 
 __Arguments__
 
 * `arr` - An array to iterate over.
-* `iterator(item, callback)` - A truth test to apply to each item in the array
-  in parallel. The iterator is passed a `callback(truthValue)`` which must be
+* `iteratee(item, callback)` - A truth test to apply to each item in the array
+  in parallel. The iteratee is passed a `callback(truthValue)`` which must be
   called with a boolean argument once it has completed.
-* `callback(result)` - *Optional* A callback which is called as soon as any iterator returns
-  `true`, or after all the iterator functions have finished. Result will be
+* `callback(result)` - *Optional* A callback which is called as soon as any iteratee returns
+  `true`, or after all the iteratee functions have finished. Result will be
   either `true` or `false` depending on the values of the async tests.
 
  **Note: the callbacks do not take an error as their first argument.**
@@ -607,28 +607,28 @@ async.some(['file1','file2','file3'], fs.exists, function(result){
 
 __Related__
 
-* someLimit(arr, limit, iterator, callback)
+* someLimit(arr, limit, iteratee, callback)
 
 ---------------------------------------
 
-<a name="every" />
-### every(arr, iterator, [callback])
+<a name="every"></a>
+### every(arr, iteratee, [callback])
 
 __Alias:__ `all`
 
 Returns `true` if every element in `arr` satisfies an async test.
-_The callback for each `iterator` call only accepts a single argument of `true` or
+_The callback for each `iteratee` call only accepts a single argument of `true` or
 `false`; it does not accept an error argument first!_ This is in-line with the
 way node libraries work with truth tests like `fs.exists`.
 
 __Arguments__
 
 * `arr` - An array to iterate over.
-* `iterator(item, callback)` - A truth test to apply to each item in the array
-  in parallel. The iterator is passed a `callback(truthValue)` which must be
+* `iteratee(item, callback)` - A truth test to apply to each item in the array
+  in parallel. The iteratee is passed a `callback(truthValue)` which must be
   called with a  boolean argument once it has completed.
-* `callback(result)` - *Optional* A callback which is called as soon as any iterator returns
-  `false`, or after all the iterator functions have finished. Result will be
+* `callback(result)` - *Optional* A callback which is called as soon as any iteratee returns
+  `false`, or after all the iteratee functions have finished. Result will be
   either `true` or `false` depending on the values of the async tests.
 
  **Note: the callbacks do not take an error as their first argument.**
@@ -643,27 +643,27 @@ async.every(['file1','file2','file3'], fs.exists, function(result){
 
 __Related__
 
-* everyLimit(arr, limit, iterator, callback)
+* everyLimit(arr, limit, iteratee, callback)
 
 ---------------------------------------
 
-<a name="concat" />
-### concat(arr, iterator, [callback])
+<a name="concat"></a>
+### concat(arr, iteratee, [callback])
 
-Applies `iterator` to each item in `arr`, concatenating the results. Returns the
-concatenated list. The `iterator`s are called in parallel, and the results are
+Applies `iteratee` to each item in `arr`, concatenating the results. Returns the
+concatenated list. The `iteratee`s are called in parallel, and the results are
 concatenated as they return. There is no guarantee that the results array will
-be returned in the original order of `arr` passed to the `iterator` function.
+be returned in the original order of `arr` passed to the `iteratee` function.
 
 __Arguments__
 
 * `arr` - An array to iterate over.
-* `iterator(item, callback)` - A function to apply to each item in `arr`.
-  The iterator is passed a `callback(err, results)` which must be called once it
+* `iteratee(item, callback)` - A function to apply to each item in `arr`.
+  The iteratee is passed a `callback(err, results)` which must be called once it
   has completed with an error (which can be `null`) and an array of results.
-* `callback(err, results)` - *Optional* A callback which is called after all the `iterator`
+* `callback(err, results)` - *Optional* A callback which is called after all the `iteratee`
   functions have finished, or an error occurs. Results is an array containing
-  the concatenated results of the `iterator` function.
+  the concatenated results of the `iteratee` function.
 
 __Example__
 
@@ -675,12 +675,12 @@ async.concat(['dir1','dir2','dir3'], fs.readdir, function(err, files){
 
 __Related__
 
-* concatSeries(arr, iterator, [callback])
+* concatSeries(arr, iteratee, [callback])
 
 
 ## Control Flow
 
-<a name="series" />
+<a name="series"></a>
 ### series(tasks, [callback])
 
 Run the functions in the `tasks` array in series, each one running once the previous
@@ -750,7 +750,7 @@ function(err, results) {
 
 ---------------------------------------
 
-<a name="parallel" />
+<a name="parallel"></a>
 ### parallel(tasks, [callback])
 
 Run the `tasks` array of functions in parallel, without waiting until the previous
@@ -822,7 +822,7 @@ __Related__
 
 ---------------------------------------
 
-<a name="whilst" />
+<a name="whilst"></a>
 ### whilst(test, fn, callback)
 
 Repeatedly call `fn`, while `test` returns `true`. Calls `callback` when stopped,
@@ -859,7 +859,7 @@ async.whilst(
 
 ---------------------------------------
 
-<a name="doWhilst" />
+<a name="doWhilst"></a>
 ### doWhilst(fn, test, callback)
 
 The post-check version of [`whilst`](#whilst). To reflect the difference in
@@ -869,7 +869,7 @@ the order of operations, the arguments `test` and `fn` are switched.
 
 ---------------------------------------
 
-<a name="until" />
+<a name="until"></a>
 ### until(test, fn, callback)
 
 Repeatedly call `fn` until `test` returns `true`. Calls `callback` when stopped,
@@ -880,14 +880,14 @@ The inverse of [`whilst`](#whilst).
 
 ---------------------------------------
 
-<a name="doUntil" />
+<a name="doUntil"></a>
 ### doUntil(fn, test, callback)
 
 Like [`doWhilst`](#doWhilst), except the `test` is inverted. Note the argument ordering differs from `until`.
 
 ---------------------------------------
 
-<a name="during" />
+<a name="during"></a>
 ### during(test, fn, callback)
 
 Like [`whilst`](#whilst), except the `test` is an asynchronous function that is passed a callback in the form of `function (err, truth)`. If error is passed to `test` or `fn`, the main callback is immediately called with the value of the error.
@@ -913,7 +913,7 @@ async.during(
 
 ---------------------------------------
 
-<a name="doDuring" />
+<a name="doDuring"></a>
 ### doDuring(fn, test, callback)
 
 The post-check version of [`during`](#during). To reflect the difference in
@@ -923,7 +923,7 @@ Also a version of [`doWhilst`](#doWhilst) with asynchronous `test` function.
 
 ---------------------------------------
 
-<a name="forever" />
+<a name="forever"></a>
 ### forever(fn, [errback])
 
 Calls the asynchronous function `fn` with a callback parameter that allows it to
@@ -947,7 +947,7 @@ async.forever(
 
 ---------------------------------------
 
-<a name="waterfall" />
+<a name="waterfall"></a>
 ### waterfall(tasks, [callback])
 
 Runs the `tasks` array of functions in series, each passing their results to the next in
@@ -985,9 +985,56 @@ async.waterfall([
     // result now equals 'done'
 });
 ```
+Or, with named functions:
+
+```js
+async.waterfall([
+    myFirstFunction,
+    mySecondFunction,
+    myLastFunction,
+], function (err, result) {
+    // result now equals 'done'
+});
+function myFirstFunction(callback) {
+    callback(null, 'one', 'two');
+}
+function mySecondFunction(arg1, arg2, callback) {
+    // arg1 now equals 'one' and arg2 now equals 'two'
+    callback(null, 'three');
+}
+function myLastFunction(arg1, callback) {
+    // arg1 now equals 'three'
+    callback(null, 'done');
+}
+```
+
+Or, if you need to pass any argument to the first function:
+
+```js
+async.waterfall([
+    async.apply(myFirstFunction, 'zero'),
+    mySecondFunction,
+    myLastFunction,
+], function (err, result) {
+    // result now equals 'done'
+});
+function myFirstFunction(arg1, callback) {
+    // arg1 now equals 'zero'
+    callback(null, 'one', 'two');
+}
+function mySecondFunction(arg1, arg2, callback) {
+    // arg1 now equals 'one' and arg2 now equals 'two'
+    callback(null, 'three');
+}
+function myLastFunction(arg1, callback) {
+    // arg1 now equals 'three'
+    callback(null, 'done');
+}
+```
 
 ---------------------------------------
-<a name="compose" />
+
+<a name="compose"></a>
 ### compose(fn1, fn2...)
 
 Creates a function which is a composition of the passed asynchronous
@@ -1025,7 +1072,8 @@ add1mul3(4, function (err, result) {
 ```
 
 ---------------------------------------
-<a name="seq" />
+
+<a name="seq"></a>
 ### seq(fn1, fn2...)
 
 Version of the compose function that is more natural to read.
@@ -1047,25 +1095,26 @@ __Example__
 // This example uses `seq` function to avoid overnesting and error
 // handling clutter.
 app.get('/cats', function(request, response) {
-  var User = request.models.User;
-  async.seq(
-    _.bind(User.get, User),  // 'User.get' has signature (id, callback(err, data))
-    function(user, fn) {
-      user.getCats(fn);      // 'getCats' has signature (callback(err, data))
-    }
-  )(req.session.user_id, function (err, cats) {
-    if (err) {
-      console.error(err);
-      response.json({ status: 'error', message: err.message });
-    } else {
-      response.json({ status: 'ok', message: 'Cats found', data: cats });
-    }
-  });
+    var User = request.models.User;
+    async.seq(
+        _.bind(User.get, User),  // 'User.get' has signature (id, callback(err, data))
+        function(user, fn) {
+            user.getCats(fn);      // 'getCats' has signature (callback(err, data))
+        }
+    )(req.session.user_id, function (err, cats) {
+        if (err) {
+            console.error(err);
+            response.json({ status: 'error', message: err.message });
+        } else {
+            response.json({ status: 'ok', message: 'Cats found', data: cats });
+        }
+    });
 });
 ```
 
 ---------------------------------------
-<a name="applyEach" />
+
+<a name="applyEach"></a>
 ### applyEach(fns, args..., callback)
 
 Applies the provided arguments to each function in the array, calling
@@ -1100,7 +1149,7 @@ __Related__
 
 ---------------------------------------
 
-<a name="queue" />
+<a name="queue"></a>
 ### queue(worker, [concurrency])
 
 Creates a `queue` object with the specified `concurrency`. Tasks added to the
@@ -1180,10 +1229,9 @@ q.unshift({name: 'bar'}, function (err) {
 });
 ```
 
-
 ---------------------------------------
 
-<a name="priorityQueue" />
+<a name="priorityQueue"></a>
 ### priorityQueue(worker, concurrency)
 
 The same as [`queue`](#queue) only tasks are assigned a priority and completed in ascending priority order. There are two differences between `queue` and `priorityQueue` objects:
@@ -1194,7 +1242,7 @@ The same as [`queue`](#queue) only tasks are assigned a priority and completed i
 
 ---------------------------------------
 
-<a name="cargo" />
+<a name="cargo"></a>
 ### cargo(worker, [payload])
 
 Creates a `cargo` object with the specified payload. Tasks added to the
@@ -1260,7 +1308,7 @@ cargo.push({name: 'baz'}, function (err) {
 
 ---------------------------------------
 
-<a name="auto" />
+<a name="auto"></a>
 ### auto(tasks, [concurrency], [callback])
 
 Determines the best order for running the functions in `tasks`, based on their requirements. Each function can optionally depend on other functions being completed first, and each function is run as soon as its requirements are satisfied.
@@ -1314,7 +1362,6 @@ __Arguments__
   an error occurs, no further `tasks` will be performed, and the results
   object will only contain partial results.
 
-
 __Example__
 
 ```js
@@ -1386,10 +1433,9 @@ function(err, results){
 For a complicated series of `async` tasks, using the [`auto`](#auto) function makes adding
 new tasks much easier (and the code more readable).
 
-
 ---------------------------------------
 
-<a name="retry" />
+<a name="retry"></a>
 ### retry([opts = {times: 5, interval: 0}| 5], task, [callback])
 
 Attempts to get a successful response from `task` no more than `times` times before
@@ -1399,8 +1445,10 @@ result (if any) of the final attempt.
 
 __Arguments__
 
-* `opts` - Can be either an object with `times` and `interval` or a number. `times` is how many attempts should be made before giving up. `interval` is how long to wait inbetween attempts. Defaults to {times: 5, interval: 0}
-  * if a number is passed in it sets `times` only (with `interval` defaulting to 0).
+* `opts` - Can be either an object with `times` and `interval` or a number.
+  * `times` - The number of attempts to make before giving up.  The default is `5`.
+  * `interval` - The time to wait between retries, in milliseconds.  The default is `0`.
+  * If `opts` is a number, the number specifies the number of times to retry, with the default interval of `0`.
 * `task(callback, results)` - A function which receives two arguments: (1) a `callback(err, result)`
   which must be called when finished, passing `err` (which can be `null`) and the `result` of
   the function's execution, and (2) a `results` object, containing the results of
@@ -1408,21 +1456,29 @@ __Arguments__
 * `callback(err, results)` - An optional callback which is called when the
   task has succeeded, or after the final failed attempt. It receives the `err` and `result` arguments of the last attempt at completing the `task`.
 
-The [`retry`](#retry) function can be used as a stand-alone control flow by passing a
-callback, as shown below:
+The [`retry`](#retry) function can be used as a stand-alone control flow by passing a callback, as shown below:
 
 ```js
+// try calling apiMethod 3 times
 async.retry(3, apiMethod, function(err, result) {
     // do something with the result
 });
 ```
 
 ```js
+// try calling apiMethod 3 times, waiting 200 ms between each retry
 async.retry({times: 3, interval: 200}, apiMethod, function(err, result) {
     // do something with the result
 });
 ```
 
+```js
+// try calling apiMethod the default 5 times no delay between each retry
+async.retry(apiMethod, function(err, result) {
+    // do something with the result
+});
+```
+
 It can also be embedded within other control flow functions to retry individual methods
 that are not as reliable, like this:
 
@@ -1435,10 +1491,9 @@ async.auto({
 });
 ```
 
-
 ---------------------------------------
 
-<a name="iterator" />
+<a name="iterator"></a>
 ### iterator(tasks)
 
 Creates an iterator function which calls the next function in the `tasks` array,
@@ -1472,9 +1527,9 @@ node> nextfn();
 'three'
 ```
 
----------------------------------------
+## Utils
 
-<a name="apply" />
+<a name="apply"></a>
 ### apply(function, arguments..)
 
 Creates a continuation function with some arguments already applied.
@@ -1525,7 +1580,7 @@ three
 
 ---------------------------------------
 
-<a name="nextTick" />
+<a name="nextTick"></a>
 ### nextTick(callback), setImmediate(callback)
 
 Calls `callback` on a later loop around the event loop. In Node.js this just
@@ -1550,16 +1605,18 @@ async.nextTick(function(){
 call_order.push('one')
 ```
 
-<a name="times" />
-### times(n, iterator, [callback])
+---------------------------------------
+
+<a name="times"></a>
+### times(n, iteratee, [callback])
 
-Calls the `iterator` function `n` times, and accumulates results in the same manner
+Calls the `iteratee` function `n` times, and accumulates results in the same manner
 you would use with [`map`](#map).
 
 __Arguments__
 
 * `n` - The number of times to run the function.
-* `iterator` - The function to call `n` times.
+* `iteratee` - The function to call `n` times.
 * `callback` - see [`map`](#map)
 
 __Example__
@@ -1583,13 +1640,12 @@ async.times(5, function(n, next){
 
 __Related__
 
-* timesSeries(n, iterator, [callback])
-* timesLimit(n, limit, iterator, [callback])
-
+* timesSeries(n, iteratee, [callback])
+* timesLimit(n, limit, iteratee, [callback])
 
-## Utils
+---------------------------------------
 
-<a name="memoize" />
+<a name="memoize"></a>
 ### memoize(fn, [hasher])
 
 Caches the results of an `async` function. When creating a hash to store function
@@ -1623,7 +1679,9 @@ fn('some name', function () {
 });
 ```
 
-<a name="unmemoize" />
+---------------------------------------
+
+<a name="unmemoize"></a>
 ### unmemoize(fn)
 
 Undoes a [`memoize`](#memoize)d function, reverting it to the original, unmemoized
@@ -1635,7 +1693,7 @@ __Arguments__
 
 ---------------------------------------
 
-<a name="ensureAsync" />
+<a name="ensureAsync"></a>
 ### ensureAsync(fn)
 
 Wrap an async function and ensure it calls its callback on a later tick of the event loop.  If the function already calls its callback on a next tick, no extra deferral is added. This is useful for preventing stack overflows (`RangeError: Maximum call stack size exceeded`) and generally keeping [Zalgo](http://blog.izs.me/post/59142742143/designing-apis-for-asynchrony) contained.
@@ -1650,11 +1708,11 @@ __Example__
 
 ```js
 function sometimesAsync(arg, callback) {
-  if (cache[arg]) {
-    return callback(null, cache[arg]); // this would be synchronous!!
-  } else {
-    doSomeIO(arg, callback); // this IO would be asynchronous
-  }
+    if (cache[arg]) {
+        return callback(null, cache[arg]); // this would be synchronous!!
+    } else {
+       doSomeIO(arg, callback); // this IO would be asynchronous
+    }
 }
 
 // this has a risk of stack overflows if many results are cached in a row
@@ -1668,7 +1726,7 @@ async.mapSeries(args, async.ensureAsync(sometimesAsync), done);
 
 ---------------------------------------
 
-<a name="constant">
+<a name="constant"></a>
 ### constant(values...)
 
 Returns a function that when called, calls-back with the values provided.  Useful as the first function in a `waterfall`, or for plugging values in to `auto`.
@@ -1677,37 +1735,37 @@ __Example__
 
 ```js
 async.waterfall([
-  async.constant(42),
-  function (value, next) {
-    // value === 42
-  },
-  //...
+    async.constant(42),
+    function (value, next) {
+        // value === 42
+    },
+    //...
 ], callback);
 
 async.waterfall([
-  async.constant(filename, "utf8"),
-  fs.readFile,
-  function (fileData, next) {
+    async.constant(filename, "utf8"),
+    fs.readFile,
+    function (fileData, next) {
+        //...
+    }
     //...
-  }
-  //...
 ], callback);
 
 async.auto({
-  hostname: async.constant("https://server.net/"),
-  port: findFreePort,
-  launchServer: ["hostname", "port", function (cb, options) {
-    startServer(options, cb);
-  }],
-  //...
+    hostname: async.constant("https://server.net/"),
+    port: findFreePort,
+    launchServer: ["hostname", "port", function (cb, options) {
+        startServer(options, cb);
+    }],
+    //...
 }, callback);
 
 ```
 
 ---------------------------------------
 
-<a name="asyncify">
-<a name="wrapSync">
+<a name="asyncify"></a>
+<a name="wrapSync"></a>
 ### asyncify(func)
 
 __Alias:__ `wrapSync`
@@ -1718,18 +1776,44 @@ __Example__
 
 ```js
 async.waterfall([
-  async.apply(fs.readFile, filename, "utf8"),
-  async.asyncify(JSON.parse),
-  function (data, next) {
-    // data is the result of parsing the text.
-    // If there was a parsing error, it would have been caught.
-  }
+    async.apply(fs.readFile, filename, "utf8"),
+    async.asyncify(JSON.parse),
+    function (data, next) {
+        // data is the result of parsing the text.
+        // If there was a parsing error, it would have been caught.
+    }
 ], callback)
 ```
 
+If the function passed to `asyncify` returns a Promise, that promises's resolved/rejected state will be used to call the callback, rather than simply the synchronous return value.  Example:
+
+```js
+async.waterfall([
+    async.apply(fs.readFile, filename, "utf8"),
+    async.asyncify(function (contents) {
+        return db.model.create(contents);
+    }),
+    function (model, next) {
+        // `model` is the instantiated model object.
+        // If there was an error, this function would be skipped.
+    }
+], callback)
+```
+
+This also means you can asyncify ES2016 `async` functions.
+
+```js
+var q = async.queue(async.asyncify(async function (file) {
+    var intermediateStep = await processFile(file);
+    return await somePromise(intermediateStep)
+}));
+
+q.push(files);
+```
+
 ---------------------------------------
 
-<a name="log" />
+<a name="log"></a>
 ### log(function, arguments)
 
 Logs the result of an `async` function to the `console`. Only works in Node.js or
@@ -1758,7 +1842,7 @@ node> async.log(hello, 'world');
 
 ---------------------------------------
 
-<a name="dir" />
+<a name="dir"></a>
 ### dir(function, arguments)
 
 Logs the result of an `async` function to the `console` using `console.dir` to
@@ -1788,7 +1872,7 @@ node> async.dir(hello, 'world');
 
 ---------------------------------------
 
-<a name="noConflict" />
+<a name="noConflict"></a>
 ### noConflict()
 
 Changes the value of `async` back to its original value, returning a reference to the
diff --git a/build/async.js b/build/async.js
index 3fe1422..034bf70 100644
--- a/build/async.js
+++ b/build/async.js
@@ -1,2196 +1,1225 @@
-(function (global, factory) {
-  typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
-  typeof define === 'function' && define.amd ? define(['exports'], factory) :
-  (factory((global.async = {})));
-}(this, function (exports) { 'use strict';
-
-  /**
-   * A faster alternative to `Function#apply`, this function invokes `func`
-   * with the `this` binding of `thisArg` and the arguments of `args`.
-   *
-   * @private
-   * @param {Function} func The function to invoke.
-   * @param {*} thisArg The `this` binding of `func`.
-   * @param {...*} args The arguments to invoke `func` with.
-   * @returns {*} Returns the result of `func`.
-   */
-  function apply$1(func, thisArg, args) {
-    var length = args.length;
-    switch (length) {
-      case 0: return func.call(thisArg);
-      case 1: return func.call(thisArg, args[0]);
-      case 2: return func.call(thisArg, args[0], args[1]);
-      case 3: return func.call(thisArg, args[0], args[1], args[2]);
+'use strict';
+
+/*!
+ * async
+ * https://github.com/caolan/async
+ *
+ * Copyright 2010-2016 Caolan McMahon
+ * Released under the MIT license
+ */
+(function () {
+
+    var async = {};
+    function noop() {}
+    function identity(v) {
+        return v;
     }
-    return func.apply(thisArg, args);
-  }
-
-  /**
-   * Checks if `value` is the [language type](https://es5.github.io/#x8) of `Object`.
-   * (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`)
-   *
-   * @static
-   * @memberOf _
-   * @category Lang
-   * @param {*} value The value to check.
-   * @returns {boolean} Returns `true` if `value` is an object, else `false`.
-   * @example
-   *
-   * _.isObject({});
-   * // => true
-   *
-   * _.isObject([1, 2, 3]);
-   * // => true
-   *
-   * _.isObject(_.noop);
-   * // => true
-   *
-   * _.isObject(null);
-   * // => false
-   */
-  function isObject(value) {
-    var type = typeof value;
-    return !!value && (type == 'object' || type == 'function');
-  }
-
-  var funcTag = '[object Function]';
-  var genTag = '[object GeneratorFunction]';
-  /** Used for built-in method references. */
-  var objectProto$4 = Object.prototype;
-
-  /**
-   * Used to resolve the [`toStringTag`](http://ecma-international.org/ecma-262/6.0/#sec-object.prototype.tostring)
-   * of values.
-   */
-  var objectToString$2 = objectProto$4.toString;
-
-  /**
-   * Checks if `value` is classified as a `Function` object.
-   *
-   * @static
-   * @memberOf _
-   * @category Lang
-   * @param {*} value The value to check.
-   * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
-   * @example
-   *
-   * _.isFunction(_);
-   * // => true
-   *
-   * _.isFunction(/abc/);
-   * // => false
-   */
-  function isFunction(value) {
-    // The use of `Object#toString` avoids issues with the `typeof` operator
-    // in Safari 8 which returns 'object' for typed array constructors, and
-    // PhantomJS 1.9 which returns 'function' for `NodeList` instances.
-    var tag = isObject(value) ? objectToString$2.call(value) : '';
-    return tag == funcTag || tag == genTag;
-  }
-
-  /** Used as references for various `Number` constants. */
-  var NAN = 0 / 0;
-
-  /** Used to match leading and trailing whitespace. */
-  var reTrim = /^\s+|\s+$/g;
-
-  /** Used to detect bad signed hexadecimal string values. */
-  var reIsBadHex = /^[-+]0x[0-9a-f]+$/i;
-
-  /** Used to detect binary string values. */
-  var reIsBinary = /^0b[01]+$/i;
-
-  /** Used to detect octal string values. */
-  var reIsOctal = /^0o[0-7]+$/i;
-
-  /** Built-in method references without a dependency on `root`. */
-  var freeParseInt = parseInt;
-
-  /**
-   * Converts `value` to a number.
-   *
-   * @static
-   * @memberOf _
-   * @category Lang
-   * @param {*} value The value to process.
-   * @returns {number} Returns the number.
-   * @example
-   *
-   * _.toNumber(3);
-   * // => 3
-   *
-   * _.toNumber(Number.MIN_VALUE);
-   * // => 5e-324
-   *
-   * _.toNumber(Infinity);
-   * // => Infinity
-   *
-   * _.toNumber('3');
-   * // => 3
-   */
-  function toNumber(value) {
-    if (isObject(value)) {
-      var other = isFunction(value.valueOf) ? value.valueOf() : value;
-      value = isObject(other) ? (other + '') : other;
+    function toBool(v) {
+        return !!v;
     }
-    if (typeof value != 'string') {
-      return value === 0 ? value : +value;
+    function notId(v) {
+        return !v;
     }
-    value = value.replace(reTrim, '');
-    var isBinary = reIsBinary.test(value);
-    return (isBinary || reIsOctal.test(value))
-      ? freeParseInt(value.slice(2), isBinary ? 2 : 8)
-      : (reIsBadHex.test(value) ? NAN : +value);
-  }
-
-  var INFINITY = 1 / 0;
-  var MAX_INTEGER = 1.7976931348623157e+308;
-  /**
-   * Converts `value` to an integer.
-   *
-   * **Note:** This function is loosely based on [`ToInteger`](http://www.ecma-international.org/ecma-262/6.0/#sec-tointeger).
-   *
-   * @static
-   * @memberOf _
-   * @category Lang
-   * @param {*} value The value to convert.
-   * @returns {number} Returns the converted integer.
-   * @example
-   *
-   * _.toInteger(3);
-   * // => 3
-   *
-   * _.toInteger(Number.MIN_VALUE);
-   * // => 0
-   *
-   * _.toInteger(Infinity);
-   * // => 1.7976931348623157e+308
-   *
-   * _.toInteger('3');
-   * // => 3
-   */
-  function toInteger(value) {
-    if (!value) {
-      return value === 0 ? value : 0;
+
+    // global on the server, window in the browser
+    var previous_async;
+
+    // Establish the root object, `window` (`self`) in the browser, `global`
+    // on the server, or `this` in some virtual machines. We use `self`
+    // instead of `window` for `WebWorker` support.
+    var root = typeof self === 'object' && self.self === self && self || typeof global === 'object' && global.global === global && global || this;
+
+    if (root != null) {
+        previous_async = root.async;
     }
-    value = toNumber(value);
-    if (value === INFINITY || value === -INFINITY) {
-      var sign = (value < 0 ? -1 : 1);
-      return sign * MAX_INTEGER;
+
+    async.noConflict = function () {
+        root.async = previous_async;
+        return async;
+    };
+
+    function only_once(fn) {
+        return function () {
+            if (fn === null) throw new Error("Callback was already called.");
+            fn.apply(this, arguments);
+            fn = null;
+        };
     }
-    var remainder = value % 1;
-    return value === value ? (remainder ? value - remainder : value) : 0;
-  }
-
-  /** Used as the `TypeError` message for "Functions" methods. */
-  var FUNC_ERROR_TEXT = 'Expected a function';
-
-  /* Built-in method references for those with the same name as other `lodash` methods. */
-  var nativeMax = Math.max;
-
-  /**
-   * Creates a function that invokes `func` with the `this` binding of the
-   * created function and arguments from `start` and beyond provided as an array.
-   *
-   * **Note:** This method is based on the [rest parameter](https://mdn.io/rest_parameters).
-   *
-   * @static
-   * @memberOf _
-   * @category Function
-   * @param {Function} func The function to apply a rest parameter to.
-   * @param {number} [start=func.length-1] The start position of the rest parameter.
-   * @returns {Function} Returns the new function.
-   * @example
-   *
-   * var say = _.rest(function(what, names) {
-   *   return what + ' ' + _.initial(names).join(', ') +
-   *     (_.size(names) > 1 ? ', & ' : '') + _.last(names);
-   * });
-   *
-   * say('hello', 'fred', 'barney', 'pebbles');
-   * // => 'hello fred, barney, & pebbles'
-   */
-  function rest(func, start) {
-    if (typeof func != 'function') {
-      throw new TypeError(FUNC_ERROR_TEXT);
+
+    function _once(fn) {
+        return function () {
+            if (fn === null) return;
+            fn.apply(this, arguments);
+            fn = null;
+        };
     }
-    start = nativeMax(start === undefined ? (func.length - 1) : toInteger(start), 0);
-    return function() {
-      var args = arguments,
-          index = -1,
-          length = nativeMax(args.length - start, 0),
-          array = Array(length);
-
-      while (++index < length) {
-        array[index] = args[start + index];
-      }
-      switch (start) {
-        case 0: return func.call(this, array);
-        case 1: return func.call(this, args[0], array);
-        case 2: return func.call(this, args[0], args[1], array);
-      }
-      var otherArgs = Array(start + 1);
-      index = -1;
-      while (++index < start) {
-        otherArgs[index] = args[index];
-      }
-      otherArgs[start] = array;
-      return apply$1(func, this, otherArgs);
+
+    //// cross-browser compatiblity functions ////
+
+    var _toString = Object.prototype.toString;
+
+    var _isArray = Array.isArray || function (obj) {
+        return _toString.call(obj) === '[object Array]';
+    };
+
+    // Ported from underscore.js isObject
+    var _isObject = function (obj) {
+        var type = typeof obj;
+        return type === 'function' || type === 'object' && !!obj;
     };
-  }
-
-  function applyEach$1(eachfn) {
-      return rest(function (fns, args) {
-          var go = rest(function (args) {
-              var that = this;
-              var callback = args.pop();
-              return eachfn(fns, function (fn, _, cb) {
-                  fn.apply(that, args.concat([cb]));
-              }, callback);
-          });
-          if (args.length) {
-              return go.apply(this, args);
-          } else {
-              return go;
-          }
-      });
-  }
-
-  /** Used as the `TypeError` message for "Functions" methods. */
-  var FUNC_ERROR_TEXT$1 = 'Expected a function';
-
-  /**
-   * Creates a function that invokes `func`, with the `this` binding and arguments
-   * of the created function, while it's called less than `n` times. Subsequent
-   * calls to the created function return the result of the last `func` invocation.
-   *
-   * @static
-   * @memberOf _
-   * @category Function
-   * @param {number} n The number of calls at which `func` is no longer invoked.
-   * @param {Function} func The function to restrict.
-   * @returns {Function} Returns the new restricted function.
-   * @example
-   *
-   * jQuery(element).on('click', _.before(5, addContactToList));
-   * // => allows adding up to 4 contacts to the list
-   */
-  function before(n, func) {
-    var result;
-    if (typeof func != 'function') {
-      throw new TypeError(FUNC_ERROR_TEXT$1);
+
+    function _isArrayLike(arr) {
+        return _isArray(arr) ||
+        // has a positive integer length property
+        typeof arr.length === "number" && arr.length >= 0 && arr.length % 1 === 0;
+    }
+
+    function _arrayEach(arr, iterator) {
+        var index = -1,
+            length = arr.length;
+
+        while (++index < length) {
+            iterator(arr[index], index, arr);
+        }
+    }
+
+    function _map(arr, iterator) {
+        var index = -1,
+            length = arr.length,
+            result = Array(length);
+
+        while (++index < length) {
+            result[index] = iterator(arr[index], index, arr);
+        }
+        return result;
+    }
+
+    function _range(count) {
+        return _map(Array(count), function (v, i) {
+            return i;
+        });
     }
-    n = toInteger(n);
-    return function() {
-      if (--n > 0) {
-        result = func.apply(this, arguments);
-      }
-      if (n <= 1) {
-        func = undefined;
-      }
-      return result;
+
+    function _reduce(arr, iterator, memo) {
+        _arrayEach(arr, function (x, i, a) {
+            memo = iterator(memo, x, i, a);
+        });
+        return memo;
+    }
+
+    function _forEachOf(object, iterator) {
+        _arrayEach(_keys(object), function (key) {
+            iterator(object[key], key);
+        });
+    }
+
+    function _indexOf(arr, item) {
+        for (var i = 0; i < arr.length; i++) {
+            if (arr[i] === item) return i;
+        }
+        return -1;
+    }
+
+    var _keys = Object.keys || function (obj) {
+        var keys = [];
+        for (var k in obj) {
+            if (obj.hasOwnProperty(k)) {
+                keys.push(k);
+            }
+        }
+        return keys;
     };
-  }
-
-  /**
-   * Creates a function that is restricted to invoking `func` once. Repeat calls
-   * to the function return the value of the first invocation. The `func` is
-   * invoked with the `this` binding and arguments of the created function.
-   *
-   * @static
-   * @memberOf _
-   * @category Function
-   * @param {Function} func The function to restrict.
-   * @returns {Function} Returns the new restricted function.
-   * @example
-   *
-   * var initialize = _.once(createApplication);
-   * initialize();
-   * initialize();
-   * // `initialize` invokes `createApplication` once
-   */
-  function once(func) {
-    return before(2, func);
-  }
-
-  /**
-   * A no-operation function that returns `undefined` regardless of the
-   * arguments it receives.
-   *
-   * @static
-   * @memberOf _
-   * @category Util
-   * @example
-   *
-   * var object = { 'user': 'fred' };
-   *
-   * _.noop(object) === undefined;
-   * // => true
-   */
-  function noop() {
-    // No operation performed.
-  }
-
-  /**
-   * The base implementation of `_.property` without support for deep paths.
-   *
-   * @private
-   * @param {string} key The key of the property to get.
-   * @returns {Function} Returns the new function.
-   */
-  function baseProperty(key) {
-    return function(object) {
-      return object == null ? undefined : object[key];
+
+    function _keyIterator(coll) {
+        var i = -1;
+        var len;
+        var keys;
+        if (_isArrayLike(coll)) {
+            len = coll.length;
+            return function next() {
+                i++;
+                return i < len ? i : null;
+            };
+        } else {
+            keys = _keys(coll);
+            len = keys.length;
+            return function next() {
+                i++;
+                return i < len ? keys[i] : null;
+            };
+        }
+    }
+
+    // Similar to ES6's rest param (http://ariya.ofilabs.com/2013/03/es6-and-rest-parameter.html)
+    // This accumulates the arguments passed into an array, after a given index.
+    // From underscore.js (https://github.com/jashkenas/underscore/pull/2140).
+    function _restParam(func, startIndex) {
+        startIndex = startIndex == null ? func.length - 1 : +startIndex;
+        return function () {
+            var length = Math.max(arguments.length - startIndex, 0);
+            var rest = Array(length);
+            for (var index = 0; index < length; index++) {
+                rest[index] = arguments[index + startIndex];
+            }
+            switch (startIndex) {
+                case 0:
+                    return func.call(this, rest);
+                case 1:
+                    return func.call(this, arguments[0], rest);
+            }
+            // Currently unused but handle cases outside of the switch statement:
+            // var args = Array(startIndex + 1);
+            // for (index = 0; index < startIndex; index++) {
+            //     args[index] = arguments[index];
+            // }
+            // args[startIndex] = rest;
+            // return func.apply(this, args);
+        };
+    }
+
+    function _withoutIndex(iterator) {
+        return function (value, index, callback) {
+            return iterator(value, callback);
+        };
+    }
+
+    //// exported async module functions ////
+
+    //// nextTick implementation with browser-compatible fallback ////
+
+    // capture the global reference to guard against fakeTimer mocks
+    var _setImmediate = typeof setImmediate === 'function' && setImmediate;
+
+    var _delay = _setImmediate ? function (fn) {
+        // not a direct alias for IE10 compatibility
+        _setImmediate(fn);
+    } : function (fn) {
+        setTimeout(fn, 0);
     };
-  }
-
-  /**
-   * Gets the "length" property value of `object`.
-   *
-   * **Note:** This function is used to avoid a [JIT bug](https://bugs.webkit.org/show_bug.cgi?id=142792)
-   * that affects Safari on at least iOS 8.1-8.3 ARM64.
-   *
-   * @private
-   * @param {Object} object The object to query.
-   * @returns {*} Returns the "length" value.
-   */
-  var getLength = baseProperty('length');
-
-  /** Used as references for various `Number` constants. */
-  var MAX_SAFE_INTEGER$1 = 9007199254740991;
-
-  /**
-   * Checks if `value` is a valid array-like length.
-   *
-   * **Note:** This function is loosely based on [`ToLength`](http://ecma-international.org/ecma-262/6.0/#sec-tolength).
-   *
-   * @static
-   * @memberOf _
-   * @category Lang
-   * @param {*} value The value to check.
-   * @returns {boolean} Returns `true` if `value` is a valid length, else `false`.
-   * @example
-   *
-   * _.isLength(3);
-   * // => true
-   *
-   * _.isLength(Number.MIN_VALUE);
-   * // => false
-   *
-   * _.isLength(Infinity);
-   * // => false
-   *
-   * _.isLength('3');
-   * // => false
-   */
-  function isLength(value) {
-    return typeof value == 'number' && value > -1 && value % 1 == 0 && value <= MAX_SAFE_INTEGER$1;
-  }
-
-  /**
-   * Checks if `value` is array-like. A value is considered array-like if it's
-   * not a function and has a `value.length` that's an integer greater than or
-   * equal to `0` and less than or equal to `Number.MAX_SAFE_INTEGER`.
-   *
-   * @static
-   * @memberOf _
-   * @type Function
-   * @category Lang
-   * @param {*} value The value to check.
-   * @returns {boolean} Returns `true` if `value` is array-like, else `false`.
-   * @example
-   *
-   * _.isArrayLike([1, 2, 3]);
-   * // => true
-   *
-   * _.isArrayLike(document.body.children);
-   * // => true
-   *
-   * _.isArrayLike('abc');
-   * // => true
-   *
-   * _.isArrayLike(_.noop);
-   * // => false
-   */
-  function isArrayLike(value) {
-    return value != null &&
-      !(typeof value == 'function' && isFunction(value)) && isLength(getLength(value));
-  }
-
-  /** Used for built-in method references. */
-  var objectProto = Object.prototype;
-
-  /** Used to check objects for own properties. */
-  var hasOwnProperty = objectProto.hasOwnProperty;
-
-  /** Built-in value references. */
-  var getPrototypeOf = Object.getPrototypeOf;
-
-  /**
-   * The base implementation of `_.has` without support for deep paths.
-   *
-   * @private
-   * @param {Object} object The object to query.
-   * @param {Array|string} key The key to check.
-   * @returns {boolean} Returns `true` if `key` exists, else `false`.
-   */
-  function baseHas(object, key) {
-    // Avoid a bug in IE 10-11 where objects with a [[Prototype]] of `null`,
-    // that are composed entirely of index properties, return `false` for
-    // `hasOwnProperty` checks of them.
-    return hasOwnProperty.call(object, key) ||
-      (typeof object == 'object' && key in object && getPrototypeOf(object) === null);
-  }
-
-  /* Built-in method references for those with the same name as other `lodash` methods. */
-  var nativeKeys = Object.keys;
-
-  /**
-   * The base implementation of `_.keys` which doesn't skip the constructor
-   * property of prototypes or treat sparse arrays as dense.
-   *
-   * @private
-   * @type Function
-   * @param {Object} object The object to query.
-   * @returns {Array} Returns the array of property names.
-   */
-  function baseKeys(object) {
-    return nativeKeys(Object(object));
-  }
-
-  /**
-   * The base implementation of `_.times` without support for iteratee shorthands
-   * or max array length checks.
-   *
-   * @private
-   * @param {number} n The number of times to invoke `iteratee`.
-   * @param {Function} iteratee The function invoked per iteration.
-   * @returns {Array} Returns the array of results.
-   */
-  function baseTimes(n, iteratee) {
-    var index = -1,
-        result = Array(n);
-
-    while (++index < n) {
-      result[index] = iteratee(index);
+
+    if (typeof process === 'object' && typeof process.nextTick === 'function') {
+        async.nextTick = process.nextTick;
+    } else {
+        async.nextTick = _delay;
     }
-    return result;
-  }
-
-  /**
-   * Checks if `value` is object-like. A value is object-like if it's not `null`
-   * and has a `typeof` result of "object".
-   *
-   * @static
-   * @memberOf _
-   * @category Lang
-   * @param {*} value The value to check.
-   * @returns {boolean} Returns `true` if `value` is object-like, else `false`.
-   * @example
-   *
-   * _.isObjectLike({});
-   * // => true
-   *
-   * _.isObjectLike([1, 2, 3]);
-   * // => true
-   *
-   * _.isObjectLike(_.noop);
-   * // => false
-   *
-   * _.isObjectLike(null);
-   * // => false
-   */
-  function isObjectLike(value) {
-    return !!value && typeof value == 'object';
-  }
-
-  /**
-   * This method is like `_.isArrayLike` except that it also checks if `value`
-   * is an object.
-   *
-   * @static
-   * @memberOf _
-   * @type Function
-   * @category Lang
-   * @param {*} value The value to check.
-   * @returns {boolean} Returns `true` if `value` is an array-like object, else `false`.
-   * @example
-   *
-   * _.isArrayLikeObject([1, 2, 3]);
-   * // => true
-   *
-   * _.isArrayLikeObject(document.body.children);
-   * // => true
-   *
-   * _.isArrayLikeObject('abc');
-   * // => false
-   *
-   * _.isArrayLikeObject(_.noop);
-   * // => false
-   */
-  function isArrayLikeObject(value) {
-    return isObjectLike(value) && isArrayLike(value);
-  }
-
-  /** `Object#toString` result references. */
-  var argsTag = '[object Arguments]';
-
-  /** Used for built-in method references. */
-  var objectProto$2 = Object.prototype;
-
-  /** Used to check objects for own properties. */
-  var hasOwnProperty$1 = objectProto$2.hasOwnProperty;
-
-  /**
-   * Used to resolve the [`toStringTag`](http://ecma-international.org/ecma-262/6.0/#sec-object.prototype.tostring)
-   * of values.
-   */
-  var objectToString = objectProto$2.toString;
-
-  /** Built-in value references. */
-  var propertyIsEnumerable = objectProto$2.propertyIsEnumerable;
-
-  /**
-   * Checks if `value` is likely an `arguments` object.
-   *
-   * @static
-   * @memberOf _
-   * @category Lang
-   * @param {*} value The value to check.
-   * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
-   * @example
-   *
-   * _.isArguments(function() { return arguments; }());
-   * // => true
-   *
-   * _.isArguments([1, 2, 3]);
-   * // => false
-   */
-  function isArguments(value) {
-    // Safari 8.1 incorrectly makes `arguments.callee` enumerable in strict mode.
-    return isArrayLikeObject(value) && hasOwnProperty$1.call(value, 'callee') &&
-      (!propertyIsEnumerable.call(value, 'callee') || objectToString.call(value) == argsTag);
-  }
-
-  /**
-   * Checks if `value` is classified as an `Array` object.
-   *
-   * @static
-   * @memberOf _
-   * @type Function
-   * @category Lang
-   * @param {*} value The value to check.
-   * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
-   * @example
-   *
-   * _.isArray([1, 2, 3]);
-   * // => true
-   *
-   * _.isArray(document.body.children);
-   * // => false
-   *
-   * _.isArray('abc');
-   * // => false
-   *
-   * _.isArray(_.noop);
-   * // => false
-   */
-  var isArray = Array.isArray;
-
-  /** `Object#toString` result references. */
-  var stringTag = '[object String]';
-
-  /** Used for built-in method references. */
-  var objectProto$3 = Object.prototype;
-
-  /**
-   * Used to resolve the [`toStringTag`](http://ecma-international.org/ecma-262/6.0/#sec-object.prototype.tostring)
-   * of values.
-   */
-  var objectToString$1 = objectProto$3.toString;
-
-  /**
-   * Checks if `value` is classified as a `String` primitive or object.
-   *
-   * @static
-   * @memberOf _
-   * @category Lang
-   * @param {*} value The value to check.
-   * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
-   * @example
-   *
-   * _.isString('abc');
-   * // => true
-   *
-   * _.isString(1);
-   * // => false
-   */
-  function isString(value) {
-    return typeof value == 'string' ||
-      (!isArray(value) && isObjectLike(value) && objectToString$1.call(value) == stringTag);
-  }
-
-  /**
-   * Creates an array of index keys for `object` values of arrays,
-   * `arguments` objects, and strings, otherwise `null` is returned.
-   *
-   * @private
-   * @param {Object} object The object to query.
-   * @returns {Array|null} Returns index keys, else `null`.
-   */
-  function indexKeys(object) {
-    var length = object ? object.length : undefined;
-    if (isLength(length) &&
-        (isArray(object) || isString(object) || isArguments(object))) {
-      return baseTimes(length, String);
+    async.setImmediate = _setImmediate ? _delay : async.nextTick;
+
+    async.forEach = async.each = function (arr, iterator, callback) {
+        return async.eachOf(arr, _withoutIndex(iterator), callback);
+    };
+
+    async.forEachSeries = async.eachSeries = function (arr, iterator, callback) {
+        return async.eachOfSeries(arr, _withoutIndex(iterator), callback);
+    };
+
+    async.forEachLimit = async.eachLimit = function (arr, limit, iterator, callback) {
+        return _eachOfLimit(limit)(arr, _withoutIndex(iterator), callback);
+    };
+
+    async.forEachOf = async.eachOf = function (object, iterator, callback) {
+        callback = _once(callback || noop);
+        object = object || [];
+
+        var iter = _keyIterator(object);
+        var key,
+            completed = 0;
+
+        while ((key = iter()) != null) {
+            completed += 1;
+            iterator(object[key], key, only_once(done));
+        }
+
+        if (completed === 0) callback(null);
+
+        function done(err) {
+            completed--;
+            if (err) {
+                callback(err);
+            }
+            // Check key is null in case iterator isn't exhausted
+            // and done resolved synchronously.
+            else if (key === null && completed <= 0) {
+                    callback(null);
+                }
+        }
+    };
+
+    async.forEachOfSeries = async.eachOfSeries = function (obj, iterator, callback) {
+        callback = _once(callback || noop);
+        obj = obj || [];
+        var nextKey = _keyIterator(obj);
+        var key = nextKey();
+        function iterate() {
+            var sync = true;
+            if (key === null) {
+                return callback(null);
+            }
+            iterator(obj[key], key, only_once(function (err) {
+                if (err) {
+                    callback(err);
+                } else {
+                    key = nextKey();
+                    if (key === null) {
+                        return callback(null);
+                    } else {
+                        if (sync) {
+                            async.setImmediate(iterate);
+                        } else {
+                            iterate();
+                        }
+                    }
+                }
+            }));
+            sync = false;
+        }
+        iterate();
+    };
+
+    async.forEachOfLimit = async.eachOfLimit = function (obj, limit, iterator, callback) {
+        _eachOfLimit(limit)(obj, iterator, callback);
+    };
+
+    function _eachOfLimit(limit) {
+
+        return function (obj, iterator, callback) {
+            callback = _once(callback || noop);
+            obj = obj || [];
+            var nextKey = _keyIterator(obj);
+            if (limit <= 0) {
+                return callback(null);
+            }
+            var done = false;
+            var running = 0;
+            var errored = false;
+
+            (function replenish() {
+                if (done && running <= 0) {
+                    return callback(null);
+                }
+
+                while (running < limit && !errored) {
+                    var key = nextKey();
+                    if (key === null) {
+                        done = true;
+                        if (running <= 0) {
+                            callback(null);
+                        }
+                        return;
+                    }
+                    running += 1;
+                    iterator(obj[key], key, only_once(function (err) {
+                        running -= 1;
+                        if (err) {
+                            callback(err);
+                            errored = true;
+                        } else {
+                            replenish();
+                        }
+                    }));
+                }
+            })();
+        };
     }
-    return null;
-  }
-
-  /** Used as references for various `Number` constants. */
-  var MAX_SAFE_INTEGER = 9007199254740991;
-
-  /** Used to detect unsigned integer values. */
-  var reIsUint = /^(?:0|[1-9]\d*)$/;
-
-  /**
-   * Checks if `value` is a valid array-like index.
-   *
-   * @private
-   * @param {*} value The value to check.
-   * @param {number} [length=MAX_SAFE_INTEGER] The upper bounds of a valid index.
-   * @returns {boolean} Returns `true` if `value` is a valid index, else `false`.
-   */
-  function isIndex(value, length) {
-    value = (typeof value == 'number' || reIsUint.test(value)) ? +value : -1;
-    length = length == null ? MAX_SAFE_INTEGER : length;
-    return value > -1 && value % 1 == 0 && value < length;
-  }
-
-  /** Used for built-in method references. */
-  var objectProto$1 = Object.prototype;
-
-  /**
-   * Checks if `value` is likely a prototype object.
-   *
-   * @private
-   * @param {*} value The value to check.
-   * @returns {boolean} Returns `true` if `value` is a prototype, else `false`.
-   */
-  function isPrototype(value) {
-    var Ctor = value && value.constructor,
-        proto = (typeof Ctor == 'function' && Ctor.prototype) || objectProto$1;
-
-    return value === proto;
-  }
-
-  /**
-   * Creates an array of the own enumerable property names of `object`.
-   *
-   * **Note:** Non-object values are coerced to objects. See the
-   * [ES spec](http://ecma-international.org/ecma-262/6.0/#sec-object.keys)
-   * for more details.
-   *
-   * @static
-   * @memberOf _
-   * @category Object
-   * @param {Object} object The object to query.
-   * @returns {Array} Returns the array of property names.
-   * @example
-   *
-   * function Foo() {
-   *   this.a = 1;
-   *   this.b = 2;
-   * }
-   *
-   * Foo.prototype.c = 3;
-   *
-   * _.keys(new Foo);
-   * // => ['a', 'b'] (iteration order is not guaranteed)
-   *
-   * _.keys('hi');
-   * // => ['0', '1']
-   */
-  function keys(object) {
-    var isProto = isPrototype(object);
-    if (!(isProto || isArrayLike(object))) {
-      return baseKeys(object);
+
+    function doParallel(fn) {
+        return function (obj, iterator, callback) {
+            return fn(async.eachOf, obj, iterator, callback);
+        };
     }
-    var indexes = indexKeys(object),
-        skipIndexes = !!indexes,
-        result = indexes || [],
-        length = result.length;
-
-    for (var key in object) {
-      if (baseHas(object, key) &&
-          !(skipIndexes && (key == 'length' || isIndex(key, length))) &&
-          !(isProto && key == 'constructor')) {
-        result.push(key);
-      }
+    function doParallelLimit(fn) {
+        return function (obj, limit, iterator, callback) {
+            return fn(_eachOfLimit(limit), obj, iterator, callback);
+        };
     }
-    return result;
-  }
-
-  function keyIterator(coll) {
-      var i = -1;
-      var len;
-      if (isArrayLike(coll)) {
-          len = coll.length;
-          return function next() {
-              i++;
-              return i < len ? i : null;
-          };
-      } else {
-          var okeys = keys(coll);
-          len = okeys.length;
-          return function next() {
-              i++;
-              return i < len ? okeys[i] : null;
-          };
-      }
-  }
-
-  function onlyOnce(fn) {
-      return function () {
-          if (fn === null) throw new Error("Callback was already called.");
-          fn.apply(this, arguments);
-          fn = null;
-      };
-  }
-
-  function eachOf(object, iterator, callback) {
-      callback = once(callback || noop);
-      object = object || [];
-
-      var iter = keyIterator(object);
-      var key,
-          completed = 0;
-
-      while ((key = iter()) != null) {
-          completed += 1;
-          iterator(object[key], key, onlyOnce(done));
-      }
-
-      if (completed === 0) callback(null);
-
-      function done(err) {
-          completed--;
-          if (err) {
-              callback(err);
-          }
-          // Check key is null in case iterator isn't exhausted
-          // and done resolved synchronously.
-          else if (key === null && completed <= 0) {
-                  callback(null);
-              }
-      }
-  }
-
-  var applyEach = applyEach$1(eachOf);
-
-  var _setImmediate = typeof setImmediate === 'function' && setImmediate;
-
-  var _delay;
-  if (_setImmediate) {
-      _delay = function (fn) {
-          // not a direct alias for IE10 compatibility
-          _setImmediate(fn);
-      };
-  } else if (typeof process === 'object' && typeof process.nextTick === 'function') {
-      _delay = process.nextTick;
-  } else {
-      _delay = function (fn) {
-          setTimeout(fn, 0);
-      };
-  }
-
-  var setImmediate$1 = _delay;
-
-  function eachOfSeries(obj, iterator, callback) {
-      callback = once(callback || noop);
-      obj = obj || [];
-      var nextKey = keyIterator(obj);
-      var key = nextKey();
-
-      function iterate() {
-          var sync = true;
-          if (key === null) {
-              return callback(null);
-          }
-          iterator(obj[key], key, onlyOnce(function (err) {
-              if (err) {
-                  callback(err);
-              } else {
-                  key = nextKey();
-                  if (key === null) {
-                      return callback(null);
-                  } else {
-                      if (sync) {
-                          setImmediate$1(iterate);
-                      } else {
-                          iterate();
-                      }
-                  }
-              }
-          }));
-          sync = false;
-      }
-      iterate();
-  }
-
-  var applyEachSeries = applyEach$1(eachOfSeries);
-
-  var apply = rest(function (fn, args) {
-      return rest(function (callArgs) {
-          return fn.apply(null, args.concat(callArgs));
-      });
-  });
-
-  function asyncify(func) {
-      return rest(function (args) {
-          var callback = args.pop();
-          var result;
-          try {
-              result = func.apply(this, args);
-          } catch (e) {
-              return callback(e);
-          }
-          // if result is Promise object
-          if (isObject(result) && typeof result.then === 'function') {
-              result.then(function (value) {
-                  callback(null, value);
-              })['catch'](function (err) {
-                  callback(err.message ? err : new Error(err));
-              });
-          } else {
-              callback(null, result);
-          }
-      });
-  }
-
-  /**
-   * A specialized version of `_.forEach` for arrays without support for
-   * iteratee shorthands.
-   *
-   * @private
-   * @param {Array} array The array to iterate over.
-   * @param {Function} iteratee The function invoked per iteration.
-   * @returns {Array} Returns `array`.
-   */
-  function arrayEach(array, iteratee) {
-    var index = -1,
-        length = array.length;
-
-    while (++index < length) {
-      if (iteratee(array[index], index, array) === false) {
-        break;
-      }
+    function doSeries(fn) {
+        return function (obj, iterator, callback) {
+            return fn(async.eachOfSeries, obj, iterator, callback);
+        };
     }
-    return array;
-  }
-
-  /**
-   * A specialized version of `_.every` for arrays without support for
-   * iteratee shorthands.
-   *
-   * @private
-   * @param {Array} array The array to iterate over.
-   * @param {Function} predicate The function invoked per iteration.
-   * @returns {boolean} Returns `true` if all elements pass the predicate check, else `false`.
-   */
-  function arrayEvery(array, predicate) {
-    var index = -1,
-        length = array.length;
-
-    while (++index < length) {
-      if (!predicate(array[index], index, array)) {
-        return false;
-      }
+
+    function _asyncMap(eachfn, arr, iterator, callback) {
+        callback = _once(callback || noop);
+        arr = arr || [];
+        var results = _isArrayLike(arr) ? [] : {};
+        eachfn(arr, function (value, index, callback) {
+            iterator(value, function (err, v) {
+                results[index] = v;
+                callback(err);
+            });
+        }, function (err) {
+            callback(err, results);
+        });
     }
-    return true;
-  }
-
-  /**
-   * Creates a base function for methods like `_.forIn`.
-   *
-   * @private
-   * @param {boolean} [fromRight] Specify iterating from right to left.
-   * @returns {Function} Returns the new base function.
-   */
-  function createBaseFor(fromRight) {
-    return function(object, iteratee, keysFunc) {
-      var index = -1,
-          iterable = Object(object),
-          props = keysFunc(object),
-          length = props.length;
-
-      while (length--) {
-        var key = props[fromRight ? length : ++index];
-        if (iteratee(iterable[key], key, iterable) === false) {
-          break;
+
+    async.map = doParallel(_asyncMap);
+    async.mapSeries = doSeries(_asyncMap);
+    async.mapLimit = doParallelLimit(_asyncMap);
+
+    // reduce only has a series version, as doing reduce in parallel won't
+    // work in many situations.
+    async.inject = async.foldl = async.reduce = function (arr, memo, iterator, callback) {
+        async.eachOfSeries(arr, function (x, i, callback) {
+            iterator(memo, x, function (err, v) {
+                memo = v;
+                callback(err);
+            });
+        }, function (err) {
+            callback(err, memo);
+        });
+    };
+
+    async.foldr = async.reduceRight = function (arr, memo, iterator, callback) {
+        var reversed = _map(arr, identity).reverse();
+        async.reduce(reversed, memo, iterator, callback);
+    };
+
+    async.transform = function (arr, memo, iterator, callback) {
+        if (arguments.length === 3) {
+            callback = iterator;
+            iterator = memo;
+            memo = _isArray(arr) ? [] : {};
         }
-      }
-      return object;
+
+        async.eachOf(arr, function (v, k, cb) {
+            iterator(memo, v, k, cb);
+        }, function (err) {
+            callback(err, memo);
+        });
     };
-  }
-
-  /**
-   * The base implementation of `baseForIn` and `baseForOwn` which iterates
-   * over `object` properties returned by `keysFunc` invoking `iteratee` for
-   * each property. Iteratee functions may exit iteration early by explicitly
-   * returning `false`.
-   *
-   * @private
-   * @param {Object} object The object to iterate over.
-   * @param {Function} iteratee The function invoked per iteration.
-   * @param {Function} keysFunc The function to get the keys of `object`.
-   * @returns {Object} Returns `object`.
-   */
-  var baseFor = createBaseFor();
-
-  /**
-   * The base implementation of `_.forOwn` without support for iteratee shorthands.
-   *
-   * @private
-   * @param {Object} object The object to iterate over.
-   * @param {Function} iteratee The function invoked per iteration.
-   * @returns {Object} Returns `object`.
-   */
-  function baseForOwn(object, iteratee) {
-    return object && baseFor(object, iteratee, keys);
-  }
-
-  /**
-   * This method returns the first argument given to it.
-   *
-   * @static
-   * @memberOf _
-   * @category Util
-   * @param {*} value Any value.
-   * @returns {*} Returns `value`.
-   * @example
-   *
-   * var object = { 'user': 'fred' };
-   *
-   * _.identity(object) === object;
-   * // => true
-   */
-  function identity(value) {
-    return value;
-  }
-
-  /**
-   * Converts `value` to a function if it's not one.
-   *
-   * @private
-   * @param {*} value The value to process.
-   * @returns {Function} Returns the function.
-   */
-  function toFunction(value) {
-    return typeof value == 'function' ? value : identity;
-  }
-
-  /**
-   * Iterates over own enumerable properties of an object invoking `iteratee`
-   * for each property. The iteratee is invoked with three arguments:
-   * (value, key, object). Iteratee functions may exit iteration early by
-   * explicitly returning `false`.
-   *
-   * @static
-   * @memberOf _
-   * @category Object
-   * @param {Object} object The object to iterate over.
-   * @param {Function} [iteratee=_.identity] The function invoked per iteration.
-   * @returns {Object} Returns `object`.
-   * @example
-   *
-   * function Foo() {
-   *   this.a = 1;
-   *   this.b = 2;
-   * }
-   *
-   * Foo.prototype.c = 3;
-   *
-   * _.forOwn(new Foo, function(value, key) {
-   *   console.log(key);
-   * });
-   * // => logs 'a' then 'b' (iteration order is not guaranteed)
-   */
-  function forOwn(object, iteratee) {
-    return object && baseForOwn(object, toFunction(iteratee));
-  }
-
-  /**
-   * Gets the index at which the first occurrence of `NaN` is found in `array`.
-   *
-   * @private
-   * @param {Array} array The array to search.
-   * @param {number} fromIndex The index to search from.
-   * @param {boolean} [fromRight] Specify iterating from right to left.
-   * @returns {number} Returns the index of the matched `NaN`, else `-1`.
-   */
-  function indexOfNaN(array, fromIndex, fromRight) {
-    var length = array.length,
-        index = fromIndex + (fromRight ? 0 : -1);
-
-    while ((fromRight ? index-- : ++index < length)) {
-      var other = array[index];
-      if (other !== other) {
-        return index;
-      }
+
+    function _filter(eachfn, arr, iterator, callback) {
+        var results = [];
+        eachfn(arr, function (x, index, callback) {
+            iterator(x, function (v) {
+                if (v) {
+                    results.push({ index: index, value: x });
+                }
+                callback();
+            });
+        }, function () {
+            callback(_map(results.sort(function (a, b) {
+                return a.index - b.index;
+            }), function (x) {
+                return x.value;
+            }));
+        });
     }
-    return -1;
-  }
-
-  /**
-   * The base implementation of `_.indexOf` without `fromIndex` bounds checks.
-   *
-   * @private
-   * @param {Array} array The array to search.
-   * @param {*} value The value to search for.
-   * @param {number} fromIndex The index to search from.
-   * @returns {number} Returns the index of the matched value, else `-1`.
-   */
-  function baseIndexOf(array, value, fromIndex) {
-    if (value !== value) {
-      return indexOfNaN(array, fromIndex);
+
+    async.select = async.filter = doParallel(_filter);
+
+    async.selectLimit = async.filterLimit = doParallelLimit(_filter);
+
+    async.selectSeries = async.filterSeries = doSeries(_filter);
+
+    function _reject(eachfn, arr, iterator, callback) {
+        _filter(eachfn, arr, function (value, cb) {
+            iterator(value, function (v) {
+                cb(!v);
+            });
+        }, callback);
     }
-    var index = fromIndex - 1,
-        length = array.length;
+    async.reject = doParallel(_reject);
+    async.rejectLimit = doParallelLimit(_reject);
+    async.rejectSeries = doSeries(_reject);
+
+    function _createTester(eachfn, check, getResult) {
+        return function (arr, limit, iterator, cb) {
+            function done() {
+                if (cb) cb(getResult(false, void 0));
+            }
+            function iteratee(x, _, callback) {
+                if (!cb) return callback();
+                iterator(x, function (v) {
+                    if (cb && check(v)) {
+                        cb(getResult(true, x));
+                        cb = iterator = false;
+                    }
+                    callback();
+                });
+            }
+            if (arguments.length > 3) {
+                eachfn(arr, limit, iteratee, done);
+            } else {
+                cb = iterator;
+                iterator = limit;
+                eachfn(arr, iteratee, done);
+            }
+        };
+    }
+
+    async.any = async.some = _createTester(async.eachOf, toBool, identity);
 
-    while (++index < length) {
-      if (array[index] === value) {
-        return index;
-      }
+    async.someLimit = _createTester(async.eachOfLimit, toBool, identity);
+
+    async.all = async.every = _createTester(async.eachOf, notId, notId);
+
+    async.everyLimit = _createTester(async.eachOfLimit, notId, notId);
+
+    function _findGetResult(v, x) {
+        return x;
     }
-    return -1;
-  }
-
-  /* Built-in method references for those with the same name as other `lodash` methods. */
-  var nativeMax$1 = Math.max;
-
-  /**
-   * Gets the index at which the first occurrence of `value` is found in `array`
-   * using [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
-   * for equality comparisons. If `fromIndex` is negative, it's used as the offset
-   * from the end of `array`.
-   *
-   * @static
-   * @memberOf _
-   * @category Array
-   * @param {Array} array The array to search.
-   * @param {*} value The value to search for.
-   * @param {number} [fromIndex=0] The index to search from.
-   * @returns {number} Returns the index of the matched value, else `-1`.
-   * @example
-   *
-   * _.indexOf([1, 2, 1, 2], 2);
-   * // => 1
-   *
-   * // Search from the `fromIndex`.
-   * _.indexOf([1, 2, 1, 2], 2, 2);
-   * // => 3
-   */
-  function indexOf(array, value, fromIndex) {
-    var length = array ? array.length : 0;
-    if (!length) {
-      return -1;
+    async.detect = _createTester(async.eachOf, identity, _findGetResult);
+    async.detectSeries = _createTester(async.eachOfSeries, identity, _findGetResult);
+    async.detectLimit = _createTester(async.eachOfLimit, identity, _findGetResult);
+
+    async.sortBy = function (arr, iterator, callback) {
+        async.map(arr, function (x, callback) {
+            iterator(x, function (err, criteria) {
+                if (err) {
+                    callback(err);
+                } else {
+                    callback(null, { value: x, criteria: criteria });
+                }
+            });
+        }, function (err, results) {
+            if (err) {
+                return callback(err);
+            } else {
+                callback(null, _map(results.sort(comparator), function (x) {
+                    return x.value;
+                }));
+            }
+        });
+
+        function comparator(left, right) {
+            var a = left.criteria,
+                b = right.criteria;
+            return a < b ? -1 : a > b ? 1 : 0;
+        }
+    };
+
+    async.auto = function (tasks, concurrency, callback) {
+        if (typeof arguments[1] === 'function') {
+            // concurrency is optional, shift the args.
+            callback = concurrency;
+            concurrency = null;
+        }
+        callback = _once(callback || noop);
+        var keys = _keys(tasks);
+        var remainingTasks = keys.length;
+        if (!remainingTasks) {
+            return callback(null);
+        }
+        if (!concurrency) {
+            concurrency = remainingTasks;
+        }
+
+        var results = {};
+        var runningTasks = 0;
+
+        var hasError = false;
+
+        var listeners = [];
+        function addListener(fn) {
+            listeners.unshift(fn);
+        }
+        function removeListener(fn) {
+            var idx = _indexOf(listeners, fn);
+            if (idx >= 0) listeners.splice(idx, 1);
+        }
+        function taskComplete() {
+            remainingTasks--;
+            _arrayEach(listeners.slice(0), function (fn) {
+                fn();
+            });
+        }
+
+        addListener(function () {
+            if (!remainingTasks) {
+                callback(null, results);
+            }
+        });
+
+        _arrayEach(keys, function (k) {
+            if (hasError) return;
+            var task = _isArray(tasks[k]) ? tasks[k] : [tasks[k]];
+            var taskCallback = _restParam(function (err, args) {
+                runningTasks--;
+                if (args.length <= 1) {
+                    args = args[0];
+                }
+                if (err) {
+                    var safeResults = {};
+                    _forEachOf(results, function (val, rkey) {
+                        safeResults[rkey] = val;
+                    });
+                    safeResults[k] = args;
+                    hasError = true;
+
+                    callback(err, safeResults);
+                } else {
+                    results[k] = args;
+                    async.setImmediate(taskComplete);
+                }
+            });
+            var requires = task.slice(0, task.length - 1);
+            // prevent dead-locks
+            var len = requires.length;
+            var dep;
+            while (len--) {
+                if (!(dep = tasks[requires[len]])) {
+                    throw new Error('Has nonexistent dependency in ' + requires.join(', '));
+                }
+                if (_isArray(dep) && _indexOf(dep, k) >= 0) {
+                    throw new Error('Has cyclic dependencies');
+                }
+            }
+            function ready() {
+                return runningTasks < concurrency && _reduce(requires, function (a, x) {
+                    return a && results.hasOwnProperty(x);
+                }, true) && !results.hasOwnProperty(k);
+            }
+            if (ready()) {
+                runningTasks++;
+                task[task.length - 1](taskCallback, results);
+            } else {
+                addListener(listener);
+            }
+            function listener() {
+                if (ready()) {
+                    runningTasks++;
+                    removeListener(listener);
+                    task[task.length - 1](taskCallback, results);
+                }
+            }
+        });
+    };
+
+    async.retry = function (times, task, callback) {
+        var DEFAULT_TIMES = 5;
+        var DEFAULT_INTERVAL = 0;
+
+        var attempts = [];
+
+        var opts = {
+            times: DEFAULT_TIMES,
+            interval: DEFAULT_INTERVAL
+        };
+
+        function parseTimes(acc, t) {
+            if (typeof t === 'number') {
+                acc.times = parseInt(t, 10) || DEFAULT_TIMES;
+            } else if (typeof t === 'object') {
+                acc.times = parseInt(t.times, 10) || DEFAULT_TIMES;
+                acc.interval = parseInt(t.interval, 10) || DEFAULT_INTERVAL;
+            } else {
+                throw new Error('Unsupported argument type for \'times\': ' + typeof t);
+            }
+        }
+
+        var length = arguments.length;
+        if (length < 1 || length > 3) {
+            throw new Error('Invalid arguments - must be either (task), (task, callback), (times, task) or (times, task, callback)');
+        } else if (length <= 2 && typeof times === 'function') {
+            callback = task;
+            task = times;
+        }
+        if (typeof times !== 'function') {
+            parseTimes(opts, times);
+        }
+        opts.callback = callback;
+        opts.task = task;
+
+        function wrappedTask(wrappedCallback, wrappedResults) {
+            function retryAttempt(task, finalAttempt) {
+                return function (seriesCallback) {
+                    task(function (err, result) {
+                        seriesCallback(!err || finalAttempt, { err: err, result: result });
+                    }, wrappedResults);
+                };
+            }
+
+            function retryInterval(interval) {
+                return function (seriesCallback) {
+                    setTimeout(function () {
+                        seriesCallback(null);
+                    }, interval);
+                };
+            }
+
+            while (opts.times) {
+
+                var finalAttempt = !(opts.times -= 1);
+                attempts.push(retryAttempt(opts.task, finalAttempt));
+                if (!finalAttempt && opts.interval > 0) {
+                    attempts.push(retryInterval(opts.interval));
+                }
+            }
+
+            async.series(attempts, function (done, data) {
+                data = data[data.length - 1];
+                (wrappedCallback || opts.callback)(data.err, data.result);
+            });
+        }
+
+        // If a callback is passed, run this as a controll flow
+        return opts.callback ? wrappedTask() : wrappedTask;
+    };
+
+    async.waterfall = function (tasks, callback) {
+        callback = _once(callback || noop);
+        if (!_isArray(tasks)) {
+            var err = new Error('First argument to waterfall must be an array of functions');
+            return callback(err);
+        }
+        if (!tasks.length) {
+            return callback();
+        }
+        function wrapIterator(iterator) {
+            return _restParam(function (err, args) {
+                if (err) {
+                    callback.apply(null, [err].concat(args));
+                } else {
+                    var next = iterator.next();
+                    if (next) {
+                        args.push(wrapIterator(next));
+                    } else {
+                        args.push(callback);
+                    }
+                    ensureAsync(iterator).apply(null, args);
+                }
+            });
+        }
+        wrapIterator(async.iterator(tasks))();
+    };
+
+    function _parallel(eachfn, tasks, callback) {
+        callback = callback || noop;
+        var results = _isArrayLike(tasks) ? [] : {};
+
+        eachfn(tasks, function (task, key, callback) {
+            task(_restParam(function (err, args) {
+                if (args.length <= 1) {
+                    args = args[0];
+                }
+                results[key] = args;
+                callback(err);
+            }));
+        }, function (err) {
+            callback(err, results);
+        });
+    }
+
+    async.parallel = function (tasks, callback) {
+        _parallel(async.eachOf, tasks, callback);
+    };
+
+    async.parallelLimit = function (tasks, limit, callback) {
+        _parallel(_eachOfLimit(limit), tasks, callback);
+    };
+
+    async.series = function (tasks, callback) {
+        _parallel(async.eachOfSeries, tasks, callback);
+    };
+
+    async.iterator = function (tasks) {
+        function makeCallback(index) {
+            function fn() {
+                if (tasks.length) {
+                    tasks[index].apply(null, arguments);
+                }
+                return fn.next();
+            }
+            fn.next = function () {
+                return index < tasks.length - 1 ? makeCallback(index + 1) : null;
+            };
+            return fn;
+        }
+        return makeCallback(0);
+    };
+
+    async.apply = _restParam(function (fn, args) {
+        return _restParam(function (callArgs) {
+            return fn.apply(null, args.concat(callArgs));
+        });
+    });
+
+    function _concat(eachfn, arr, fn, callback) {
+        var result = [];
+        eachfn(arr, function (x, index, cb) {
+            fn(x, function (err, y) {
+                result = result.concat(y || []);
+                cb(err);
+            });
+        }, function (err) {
+            callback(err, result);
+        });
+    }
+    async.concat = doParallel(_concat);
+    async.concatSeries = doSeries(_concat);
+
+    async.whilst = function (test, iterator, callback) {
+        callback = callback || noop;
+        if (test()) {
+            var next = _restParam(function (err, args) {
+                if (err) {
+                    callback(err);
+                } else if (test.apply(this, args)) {
+                    iterator(next);
+                } else {
+                    callback.apply(null, [null].concat(args));
+                }
+            });
+            iterator(next);
+        } else {
+            callback(null);
+        }
+    };
+
+    async.doWhilst = function (iterator, test, callback) {
+        var calls = 0;
+        return async.whilst(function () {
+            return ++calls <= 1 || test.apply(this, arguments);
+        }, iterator, callback);
+    };
+
+    async.until = function (test, iterator, callback) {
+        return async.whilst(function () {
+            return !test.apply(this, arguments);
+        }, iterator, callback);
+    };
+
+    async.doUntil = function (iterator, test, callback) {
+        return async.doWhilst(iterator, function () {
+            return !test.apply(this, arguments);
+        }, callback);
+    };
+
+    async.during = function (test, iterator, callback) {
+        callback = callback || noop;
+
+        var next = _restParam(function (err, args) {
+            if (err) {
+                callback(err);
+            } else {
+                args.push(check);
+                test.apply(this, args);
+            }
+        });
+
+        var check = function (err, truth) {
+            if (err) {
+                callback(err);
+            } else if (truth) {
+                iterator(next);
+            } else {
+                callback(null);
+            }
+        };
+
+        test(check);
+    };
+
+    async.doDuring = function (iterator, test, callback) {
+        var calls = 0;
+        async.during(function (next) {
+            if (calls++ < 1) {
+                next(null, true);
+            } else {
+                test.apply(this, arguments);
+            }
+        }, iterator, callback);
+    };
+
+    function _queue(worker, concurrency, payload) {
+        if (concurrency == null) {
+            concurrency = 1;
+        } else if (concurrency === 0) {
+            throw new Error('Concurrency must not be zero');
+        }
+        function _insert(q, data, pos, callback) {
+            if (callback != null && typeof callback !== "function") {
+                throw new Error("task callback must be a function");
+            }
+            q.started = true;
+            if (!_isArray(data)) {
+                data = [data];
+            }
+            if (data.length === 0 && q.idle()) {
+                // call drain immediately if there are no tasks
+                return async.setImmediate(function () {
+                    q.drain();
+                });
+            }
+            _arrayEach(data, function (task) {
+                var item = {
+                    data: task,
+                    callback: callback || noop
+                };
+
+                if (pos) {
+                    q.tasks.unshift(item);
+                } else {
+                    q.tasks.push(item);
+                }
+
+                if (q.tasks.length === q.concurrency) {
+                    q.saturated();
+                }
+            });
+            async.setImmediate(q.process);
+        }
+        function _next(q, tasks) {
+            return function () {
+                workers -= 1;
+
+                var removed = false;
+                var args = arguments;
+                _arrayEach(tasks, function (task) {
+                    _arrayEach(workersList, function (worker, index) {
+                        if (worker === task && !removed) {
+                            workersList.splice(index, 1);
+                            removed = true;
+                        }
+                    });
+
+                    task.callback.apply(task, args);
+                });
+                if (q.tasks.length + workers === 0) {
+                    q.drain();
+                }
+                q.process();
+            };
+        }
+
+        var workers = 0;
+        var workersList = [];
+        var q = {
+            tasks: [],
+            concurrency: concurrency,
+            payload: payload,
+            saturated: noop,
+            empty: noop,
+            drain: noop,
+            started: false,
+            paused: false,
+            push: function (data, callback) {
+                _insert(q, data, false, callback);
+            },
+            kill: function () {
+                q.drain = noop;
+                q.tasks = [];
+            },
+            unshift: function (data, callback) {
+                _insert(q, data, true, callback);
+            },
+            process: function () {
+                while (!q.paused && workers < q.concurrency && q.tasks.length) {
+
+                    var tasks = q.payload ? q.tasks.splice(0, q.payload) : q.tasks.splice(0, q.tasks.length);
+
+                    var data = _map(tasks, function (task) {
+                        return task.data;
+                    });
+
+                    if (q.tasks.length === 0) {
+                        q.empty();
+                    }
+                    workers += 1;
+                    workersList.push(tasks[0]);
+                    var cb = only_once(_next(q, tasks));
+                    worker(data, cb);
+                }
+            },
+            length: function () {
+                return q.tasks.length;
+            },
+            running: function () {
+                return workers;
+            },
+            workersList: function () {
+                return workersList;
+            },
+            idle: function () {
+                return q.tasks.length + workers === 0;
+            },
+            pause: function () {
+                q.paused = true;
+            },
+            resume: function () {
+                if (q.paused === false) {
+                    return;
+                }
+                q.paused = false;
+                var resumeCount = Math.min(q.concurrency, q.tasks.length);
+                // Need to call q.process once per concurrent
+                // worker to preserve full concurrency after pause
+                for (var w = 1; w <= resumeCount; w++) {
+                    async.setImmediate(q.process);
+                }
+            }
+        };
+        return q;
+    }
+
+    async.queue = function (worker, concurrency) {
+        var q = _queue(function (items, cb) {
+            worker(items[0], cb);
+        }, concurrency, 1);
+
+        return q;
+    };
+
+    async.priorityQueue = function (worker, concurrency) {
+
+        function _compareTasks(a, b) {
+            return a.priority - b.priority;
+        }
+
+        function _binarySearch(sequence, item, compare) {
+            var beg = -1,
+                end = sequence.length - 1;
+            while (beg < end) {
+                var mid = beg + (end - beg + 1 >>> 1);
+                if (compare(item, sequence[mid]) >= 0) {
+                    beg = mid;
+                } else {
+                    end = mid - 1;
+                }
+            }
+            return beg;
+        }
+
+        function _insert(q, data, priority, callback) {
+            if (callback != null && typeof callback !== "function") {
+                throw new Error("task callback must be a function");
+            }
+            q.started = true;
+            if (!_isArray(data)) {
+                data = [data];
+            }
+            if (data.length === 0) {
+                // call drain immediately if there are no tasks
+                return async.setImmediate(function () {
+                    q.drain();
+                });
+            }
+            _arrayEach(data, function (task) {
+                var item = {
+                    data: task,
+                    priority: priority,
+                    callback: typeof callback === 'function' ? callback : noop
+                };
+
+                q.tasks.splice(_binarySearch(q.tasks, item, _compareTasks) + 1, 0, item);
+
+                if (q.tasks.length === q.concurrency) {
+                    q.saturated();
+                }
+                async.setImmediate(q.process);
+            });
+        }
+
+        // Start with a normal queue
+        var q = async.queue(worker, concurrency);
+
+        // Override push to accept second parameter representing priority
+        q.push = function (data, priority, callback) {
+            _insert(q, data, priority, callback);
+        };
+
+        // Remove unshift function
+        delete q.unshift;
+
+        return q;
+    };
+
+    async.cargo = function (worker, payload) {
+        return _queue(worker, 1, payload);
+    };
+
+    function _console_fn(name) {
+        return _restParam(function (fn, args) {
+            fn.apply(null, args.concat([_restParam(function (err, args) {
+                if (typeof console === 'object') {
+                    if (err) {
+                        if (console.error) {
+                            console.error(err);
+                        }
+                    } else if (console[name]) {
+                        _arrayEach(args, function (x) {
+                            console[name](x);
+                        });
+                    }
+                }
+            })]));
+        });
     }
-    fromIndex = toInteger(fromIndex);
-    if (fromIndex < 0) {
-      fromIndex = nativeMax$1(length + fromIndex, 0);
+    async.log = _console_fn('log');
+    async.dir = _console_fn('dir');
+    /*async.info = _console_fn('info');
+    async.warn = _console_fn('warn');
+    async.error = _console_fn('error');*/
+
+    async.memoize = function (fn, hasher) {
+        var memo = {};
+        var queues = {};
+        var has = Object.prototype.hasOwnProperty;
+        hasher = hasher || identity;
+        var memoized = _restParam(function memoized(args) {
+            var callback = args.pop();
+            var key = hasher.apply(null, args);
+            if (has.call(memo, key)) {
+                async.setImmediate(function () {
+                    callback.apply(null, memo[key]);
+                });
+            } else if (has.call(queues, key)) {
+                queues[key].push(callback);
+            } else {
+                queues[key] = [callback];
+                fn.apply(null, args.concat([_restParam(function (args) {
+                    memo[key] = args;
+                    var q = queues[key];
+                    delete queues[key];
+                    for (var i = 0, l = q.length; i < l; i++) {
+                        q[i].apply(null, args);
+                    }
+                })]));
+            }
+        });
+        memoized.memo = memo;
+        memoized.unmemoized = fn;
+        return memoized;
+    };
+
+    async.unmemoize = function (fn) {
+        return function () {
+            return (fn.unmemoized || fn).apply(null, arguments);
+        };
+    };
+
+    function _times(mapper) {
+        return function (count, iterator, callback) {
+            mapper(_range(count), iterator, callback);
+        };
+    }
+
+    async.times = _times(async.map);
+    async.timesSeries = _times(async.mapSeries);
+    async.timesLimit = function (count, limit, iterator, callback) {
+        return async.mapLimit(_range(count), limit, iterator, callback);
+    };
+
+    async.seq = function () /* functions... */{
+        var fns = arguments;
+        return _restParam(function (args) {
+            var that = this;
+
+            var callback = args[args.length - 1];
+            if (typeof callback == 'function') {
+                args.pop();
+            } else {
+                callback = noop;
+            }
+
+            async.reduce(fns, args, function (newargs, fn, cb) {
+                fn.apply(that, newargs.concat([_restParam(function (err, nextargs) {
+                    cb(err, nextargs);
+                })]));
+            }, function (err, results) {
+                callback.apply(that, [err].concat(results));
+            });
+        });
+    };
+
+    async.compose = function () /* functions... */{
+        return async.seq.apply(null, Array.prototype.reverse.call(arguments));
+    };
+
+    function _applyEach(eachfn) {
+        return _restParam(function (fns, args) {
+            var go = _restParam(function (args) {
+                var that = this;
+                var callback = args.pop();
+                return eachfn(fns, function (fn, _, cb) {
+                    fn.apply(that, args.concat([cb]));
+                }, callback);
+            });
+            if (args.length) {
+                return go.apply(this, args);
+            } else {
+                return go;
+            }
+        });
     }
-    return baseIndexOf(array, value, fromIndex);
-  }
-
-  function auto (tasks, concurrency, callback) {
-      if (typeof arguments[1] === 'function') {
-          // concurrency is optional, shift the args.
-          callback = concurrency;
-          concurrency = null;
-      }
-      callback = once(callback || noop);
-      var keys$$ = keys(tasks);
-      var remainingTasks = keys$$.length;
-      if (!remainingTasks) {
-          return callback(null);
-      }
-      if (!concurrency) {
-          concurrency = remainingTasks;
-      }
-
-      var results = {};
-      var runningTasks = 0;
-
-      var listeners = [];
-      function addListener(fn) {
-          listeners.unshift(fn);
-      }
-      function removeListener(fn) {
-          var idx = indexOf(listeners, fn);
-          if (idx >= 0) listeners.splice(idx, 1);
-      }
-      function taskComplete() {
-          remainingTasks--;
-          arrayEach(listeners.slice(), function (fn) {
-              fn();
-          });
-      }
-
-      addListener(function () {
-          if (!remainingTasks) {
-              callback(null, results);
-          }
-      });
-
-      arrayEach(keys$$, function (k) {
-          var task = isArray(tasks[k]) ? tasks[k] : [tasks[k]];
-          var taskCallback = rest(function (err, args) {
-              runningTasks--;
-              if (args.length <= 1) {
-                  args = args[0];
-              }
-              if (err) {
-                  var safeResults = {};
-                  forOwn(results, function (val, rkey) {
-                      safeResults[rkey] = val;
-                  });
-                  safeResults[k] = args;
-                  callback(err, safeResults);
-              } else {
-                  results[k] = args;
-                  setImmediate$1(taskComplete);
-              }
-          });
-          var requires = task.slice(0, task.length - 1);
-          // prevent dead-locks
-          var len = requires.length;
-          var dep;
-          while (len--) {
-              if (!(dep = tasks[requires[len]])) {
-                  throw new Error('Has inexistant dependency');
-              }
-              if (isArray(dep) && indexOf(dep, k) >= 0) {
-                  throw new Error('Has cyclic dependencies');
-              }
-          }
-          function ready() {
-              return runningTasks < concurrency && !baseHas(results, k) && arrayEvery(requires, function (x) {
-                  return baseHas(results, x);
-              });
-          }
-          if (ready()) {
-              runningTasks++;
-              task[task.length - 1](taskCallback, results);
-          } else {
-              addListener(listener);
-          }
-          function listener() {
-              if (ready()) {
-                  runningTasks++;
-                  removeListener(listener);
-                  task[task.length - 1](taskCallback, results);
-              }
-          }
-      });
-  }
-
-  /**
-   * A specialized version of `_.map` for arrays without support for iteratee
-   * shorthands.
-   *
-   * @private
-   * @param {Array} array The array to iterate over.
-   * @param {Function} iteratee The function invoked per iteration.
-   * @returns {Array} Returns the new mapped array.
-   */
-  function arrayMap(array, iteratee) {
-    var index = -1,
-        length = array.length,
-        result = Array(length);
-
-    while (++index < length) {
-      result[index] = iteratee(array[index], index, array);
+
+    async.applyEach = _applyEach(async.eachOf);
+    async.applyEachSeries = _applyEach(async.eachOfSeries);
+
+    async.forever = function (fn, callback) {
+        var done = only_once(callback || noop);
+        var task = ensureAsync(fn);
+        function next(err) {
+            if (err) {
+                return done(err);
+            }
+            task(next);
+        }
+        next();
+    };
+
+    function ensureAsync(fn) {
+        return _restParam(function (args) {
+            var callback = args.pop();
+            args.push(function () {
+                var innerArgs = arguments;
+                if (sync) {
+                    async.setImmediate(function () {
+                        callback.apply(null, innerArgs);
+                    });
+                } else {
+                    callback.apply(null, innerArgs);
+                }
+            });
+            var sync = true;
+            fn.apply(this, args);
+            sync = false;
+        });
     }
-    return result;
-  }
-
-  function queue$1(worker, concurrency, payload) {
-      if (concurrency == null) {
-          concurrency = 1;
-      } else if (concurrency === 0) {
-          throw new Error('Concurrency must not be zero');
-      }
-      function _insert(q, data, pos, callback) {
-          if (callback != null && typeof callback !== 'function') {
-              throw new Error('task callback must be a function');
-          }
-          q.started = true;
-          if (!isArray(data)) {
-              data = [data];
-          }
-          if (data.length === 0 && q.idle()) {
-              // call drain immediately if there are no tasks
-              return setImmediate$1(function () {
-                  q.drain();
-              });
-          }
-          arrayEach(data, function (task) {
-              var item = {
-                  data: task,
-                  callback: callback || noop
-              };
-
-              if (pos) {
-                  q.tasks.unshift(item);
-              } else {
-                  q.tasks.push(item);
-              }
-
-              if (q.tasks.length === q.concurrency) {
-                  q.saturated();
-              }
-          });
-          setImmediate$1(q.process);
-      }
-      function _next(q, tasks) {
-          return function () {
-              workers -= 1;
-
-              var removed = false;
-              var args = arguments;
-              arrayEach(tasks, function (task) {
-                  arrayEach(workersList, function (worker, index) {
-                      if (worker === task && !removed) {
-                          workersList.splice(index, 1);
-                          removed = true;
-                      }
-                  });
-
-                  task.callback.apply(task, args);
-              });
-              if (q.tasks.length + workers === 0) {
-                  q.drain();
-              }
-              q.process();
-          };
-      }
-
-      var workers = 0;
-      var workersList = [];
-      var q = {
-          tasks: [],
-          concurrency: concurrency,
-          payload: payload,
-          saturated: noop,
-          empty: noop,
-          drain: noop,
-          started: false,
-          paused: false,
-          push: function (data, callback) {
-              _insert(q, data, false, callback);
-          },
-          kill: function () {
-              q.drain = noop;
-              q.tasks = [];
-          },
-          unshift: function (data, callback) {
-              _insert(q, data, true, callback);
-          },
-          process: function () {
-              while (!q.paused && workers < q.concurrency && q.tasks.length) {
-
-                  var tasks = q.payload ? q.tasks.splice(0, q.payload) : q.tasks.splice(0, q.tasks.length);
-
-                  var data = arrayMap(tasks, baseProperty('data'));
-
-                  if (q.tasks.length === 0) {
-                      q.empty();
-                  }
-                  workers += 1;
-                  workersList.push(tasks[0]);
-                  var cb = onlyOnce(_next(q, tasks));
-                  worker(data, cb);
-              }
-          },
-          length: function () {
-              return q.tasks.length;
-          },
-          running: function () {
-              return workers;
-          },
-          workersList: function () {
-              return workersList;
-          },
-          idle: function () {
-              return q.tasks.length + workers === 0;
-          },
-          pause: function () {
-              q.paused = true;
-          },
-          resume: function () {
-              if (q.paused === false) {
-                  return;
-              }
-              q.paused = false;
-              var resumeCount = Math.min(q.concurrency, q.tasks.length);
-              // Need to call q.process once per concurrent
-              // worker to preserve full concurrency after pause
-              for (var w = 1; w <= resumeCount; w++) {
-                  setImmediate$1(q.process);
-              }
-          }
-      };
-      return q;
-  }
-
-  function cargo(worker, payload) {
-      return queue$1(worker, 1, payload);
-  }
-
-  function reduce(arr, memo, iterator, cb) {
-      eachOfSeries(arr, function (x, i, cb) {
-          iterator(memo, x, function (err, v) {
-              memo = v;
-              cb(err);
-          });
-      }, function (err) {
-          cb(err, memo);
-      });
-  }
-
-  function seq() /* functions... */{
-      var fns = arguments;
-      return rest(function (args) {
-          var that = this;
-
-          var cb = args[args.length - 1];
-          if (typeof cb == 'function') {
-              args.pop();
-          } else {
-              cb = noop;
-          }
-
-          reduce(fns, args, function (newargs, fn, cb) {
-              fn.apply(that, newargs.concat([rest(function (err, nextargs) {
-                  cb(err, nextargs);
-              })]));
-          }, function (err, results) {
-              cb.apply(that, [err].concat(results));
-          });
-      });
-  }
-
-  var reverse = Array.prototype.reverse;
-
-  function compose() /* functions... */{
-      return seq.apply(null, reverse.call(arguments));
-  }
-
-  function concat$1(eachfn, arr, fn, callback) {
-      var result = [];
-      eachfn(arr, function (x, index, cb) {
-          fn(x, function (err, y) {
-              result = result.concat(y || []);
-              cb(err);
-          });
-      }, function (err) {
-          callback(err, result);
-      });
-  }
-
-  function doParallel(fn) {
-      return function (obj, iterator, callback) {
-          return fn(eachOf, obj, iterator, callback);
-      };
-  }
-
-  var concat = doParallel(concat$1);
-
-  function doSeries(fn) {
-      return function (obj, iterator, callback) {
-          return fn(eachOfSeries, obj, iterator, callback);
-      };
-  }
-
-  var concatSeries = doSeries(concat$1);
-
-  var constant = rest(function (values) {
-      var args = [null].concat(values);
-      return function (cb) {
-          return cb.apply(this, args);
-      };
-  });
-
-  function _createTester(eachfn, check, getResult) {
-      return function (arr, limit, iterator, cb) {
-          function done() {
-              if (cb) cb(getResult(false, void 0));
-          }
-          function iteratee(x, _, callback) {
-              if (!cb) return callback();
-              iterator(x, function (v) {
-                  if (cb && check(v)) {
-                      cb(getResult(true, x));
-                      cb = iterator = false;
-                  }
-                  callback();
-              });
-          }
-          if (arguments.length > 3) {
-              eachfn(arr, limit, iteratee, done);
-          } else {
-              cb = iterator;
-              iterator = limit;
-              eachfn(arr, iteratee, done);
-          }
-      };
-  }
-
-  function _findGetResult(v, x) {
-      return x;
-  }
-
-  var detect = _createTester(eachOf, identity, _findGetResult);
-
-  function _eachOfLimit(limit) {
-      return function (obj, iterator, callback) {
-          callback = once(callback || noop);
-          obj = obj || [];
-          var nextKey = keyIterator(obj);
-          if (limit <= 0) {
-              return callback(null);
-          }
-          var done = false;
-          var running = 0;
-          var errored = false;
-
-          (function replenish() {
-              if (done && running <= 0) {
-                  return callback(null);
-              }
-
-              while (running < limit && !errored) {
-                  var key = nextKey();
-                  if (key === null) {
-                      done = true;
-                      if (running <= 0) {
-                          callback(null);
-                      }
-                      return;
-                  }
-                  running += 1;
-                  iterator(obj[key], key, onlyOnce(function (err) {
-                      running -= 1;
-                      if (err) {
-                          callback(err);
-                          errored = true;
-                      } else {
-                          replenish();
-                      }
-                  }));
-              }
-          })();
-      };
-  }
-
-  function eachOfLimit(obj, limit, iterator, cb) {
-      _eachOfLimit(limit)(obj, iterator, cb);
-  }
-
-  var detectLimit = _createTester(eachOfLimit, identity, _findGetResult);
-
-  var detectSeries = _createTester(eachOfSeries, identity, _findGetResult);
-
-  function consoleFunc(name) {
-      return rest(function (fn, args) {
-          fn.apply(null, args.concat([rest(function (err, args) {
-              if (typeof console === 'object') {
-                  if (err) {
-                      if (console.error) {
-                          console.error(err);
-                      }
-                  } else if (console[name]) {
-                      arrayEach(args, function (x) {
-                          console[name](x);
-                      });
-                  }
-              }
-          })]));
-      });
-  }
-
-  var dir = consoleFunc('dir');
-
-  function during(test, iterator, cb) {
-      cb = cb || noop;
-
-      var next = rest(function (err, args) {
-          if (err) {
-              cb(err);
-          } else {
-              args.push(check);
-              test.apply(this, args);
-          }
-      });
-
-      var check = function (err, truth) {
-          if (err) return cb(err);
-          if (!truth) return cb(null);
-          iterator(next);
-      };
-
-      test(check);
-  }
-
-  function doDuring(iterator, test, cb) {
-      var calls = 0;
-
-      during(function (next) {
-          if (calls++ < 1) return next(null, true);
-          test.apply(this, arguments);
-      }, iterator, cb);
-  }
-
-  function whilst(test, iterator, cb) {
-      cb = cb || noop;
-      if (!test()) return cb(null);
-      var next = rest(function (err, args) {
-          if (err) return cb(err);
-          if (test.apply(this, args)) return iterator(next);
-          cb.apply(null, [null].concat(args));
-      });
-      iterator(next);
-  }
-
-  function doWhilst(iterator, test, cb) {
-      var calls = 0;
-      return whilst(function () {
-          return ++calls <= 1 || test.apply(this, arguments);
-      }, iterator, cb);
-  }
-
-  function doUntil(iterator, test, cb) {
-      return doWhilst(iterator, function () {
-          return !test.apply(this, arguments);
-      }, cb);
-  }
-
-  function _withoutIndex(iterator) {
-      return function (value, index, callback) {
-          return iterator(value, callback);
-      };
-  }
-
-  function each(arr, iterator, cb) {
-      return eachOf(arr, _withoutIndex(iterator), cb);
-  }
-
-  function eachLimit(arr, limit, iterator, cb) {
-      return _eachOfLimit(limit)(arr, _withoutIndex(iterator), cb);
-  }
-
-  function eachSeries(arr, iterator, cb) {
-      return eachOfSeries(arr, _withoutIndex(iterator), cb);
-  }
-
-  function ensureAsync(fn) {
-      return rest(function (args) {
-          var callback = args.pop();
-          var sync = true;
-          args.push(function () {
-              var innerArgs = arguments;
-              if (sync) {
-                  setImmediate$1(function () {
-                      callback.apply(null, innerArgs);
-                  });
-              } else {
-                  callback.apply(null, innerArgs);
-              }
-          });
-          fn.apply(this, args);
-          sync = false;
-      });
-  }
-
-  function notId(v) {
-      return !v;
-  }
-
-  var every = _createTester(eachOf, notId, notId);
-
-  var everyLimit = _createTester(eachOfLimit, notId, notId);
-
-  function _filter(eachfn, arr, iterator, callback) {
-      var results = [];
-      eachfn(arr, function (x, index, callback) {
-          iterator(x, function (v) {
-              if (v) {
-                  results.push({ index: index, value: x });
-              }
-              callback();
-          });
-      }, function () {
-          callback(arrayMap(results.sort(function (a, b) {
-              return a.index - b.index;
-          }), baseProperty('value')));
-      });
-  }
-
-  var filter = doParallel(_filter);
-
-  function doParallelLimit(fn) {
-      return function (obj, limit, iterator, callback) {
-          return fn(_eachOfLimit(limit), obj, iterator, callback);
-      };
-  }
-
-  var filterLimit = doParallelLimit(_filter);
-
-  var filterSeries = doSeries(_filter);
-
-  function forever(fn, cb) {
-      var done = onlyOnce(cb || noop);
-      var task = ensureAsync(fn);
-
-      function next(err) {
-          if (err) return done(err);
-          task(next);
-      }
-      next();
-  }
-
-  function iterator (tasks) {
-      function makeCallback(index) {
-          function fn() {
-              if (tasks.length) {
-                  tasks[index].apply(null, arguments);
-              }
-              return fn.next();
-          }
-          fn.next = function () {
-              return index < tasks.length - 1 ? makeCallback(index + 1) : null;
-          };
-          return fn;
-      }
-      return makeCallback(0);
-  }
-
-  var log = consoleFunc('log');
-
-  function _asyncMap(eachfn, arr, iterator, callback) {
-      callback = once(callback || noop);
-      arr = arr || [];
-      var results = isArrayLike(arr) ? [] : {};
-      eachfn(arr, function (value, index, callback) {
-          iterator(value, function (err, v) {
-              results[index] = v;
-              callback(err);
-          });
-      }, function (err) {
-          callback(err, results);
-      });
-  }
-
-  var map = doParallel(_asyncMap);
-
-  var mapLimit = doParallelLimit(_asyncMap);
-
-  var mapSeries = doSeries(_asyncMap);
-
-  function memoize(fn, hasher) {
-      var memo = {};
-      var queues = {};
-      hasher = hasher || identity;
-      var memoized = rest(function memoized(args) {
-          var callback = args.pop();
-          var key = hasher.apply(null, args);
-          if (key in memo) {
-              setImmediate$1(function () {
-                  callback.apply(null, memo[key]);
-              });
-          } else if (key in queues) {
-              queues[key].push(callback);
-          } else {
-              queues[key] = [callback];
-              fn.apply(null, args.concat([rest(function (args) {
-                  memo[key] = args;
-                  var q = queues[key];
-                  delete queues[key];
-                  for (var i = 0, l = q.length; i < l; i++) {
-                      q[i].apply(null, args);
-                  }
-              })]));
-          }
-      });
-      memoized.memo = memo;
-      memoized.unmemoized = fn;
-      return memoized;
-  }
-
-  var nexTick = typeof process === 'object' && typeof process.nextTick === 'function' ? process.nextTick : setImmediate$1;
-
-  function _parallel(eachfn, tasks, callback) {
-      callback = callback || noop;
-      var results = isArrayLike(tasks) ? [] : {};
-
-      eachfn(tasks, function (task, key, callback) {
-          task(rest(function (err, args) {
-              if (args.length <= 1) {
-                  args = args[0];
-              }
-              results[key] = args;
-              callback(err);
-          }));
-      }, function (err) {
-          callback(err, results);
-      });
-  }
-
-  function parallel(tasks, cb) {
-      return _parallel(eachOf, tasks, cb);
-  }
-
-  function parallelLimit(tasks, limit, cb) {
-      return _parallel(_eachOfLimit(limit), tasks, cb);
-  }
-
-  function queue (worker, concurrency) {
-      return queue$1(function (items, cb) {
-          worker(items[0], cb);
-      }, concurrency, 1);
-  }
-
-  function priorityQueue (worker, concurrency) {
-      function _compareTasks(a, b) {
-          return a.priority - b.priority;
-      }
-
-      function _binarySearch(sequence, item, compare) {
-          var beg = -1,
-              end = sequence.length - 1;
-          while (beg < end) {
-              var mid = beg + (end - beg + 1 >>> 1);
-              if (compare(item, sequence[mid]) >= 0) {
-                  beg = mid;
-              } else {
-                  end = mid - 1;
-              }
-          }
-          return beg;
-      }
-
-      function _insert(q, data, priority, callback) {
-          if (callback != null && typeof callback !== 'function') {
-              throw new Error('task callback must be a function');
-          }
-          q.started = true;
-          if (!isArray(data)) {
-              data = [data];
-          }
-          if (data.length === 0) {
-              // call drain immediately if there are no tasks
-              return setImmediate$1(function () {
-                  q.drain();
-              });
-          }
-          arrayEach(data, function (task) {
-              var item = {
-                  data: task,
-                  priority: priority,
-                  callback: typeof callback === 'function' ? callback : noop
-              };
-
-              q.tasks.splice(_binarySearch(q.tasks, item, _compareTasks) + 1, 0, item);
-
-              if (q.tasks.length === q.concurrency) {
-                  q.saturated();
-              }
-              setImmediate$1(q.process);
-          });
-      }
-
-      // Start with a normal queue
-      var q = queue(worker, concurrency);
-
-      // Override push to accept second parameter representing priority
-      q.push = function (data, priority, callback) {
-          _insert(q, data, priority, callback);
-      };
-
-      // Remove unshift function
-      delete q.unshift;
-
-      return q;
-  }
-
-  var slice = Array.prototype.slice;
-
-  function reduceRight(arr, memo, iterator, cb) {
-      var reversed = slice.call(arr).reverse();
-      reduce(reversed, memo, iterator, cb);
-  }
-
-  function reject$1(eachfn, arr, iterator, callback) {
-      _filter(eachfn, arr, function (value, cb) {
-          iterator(value, function (v) {
-              cb(!v);
-          });
-      }, callback);
-  }
-
-  var reject = doParallel(reject$1);
-
-  var rejectLimit = doParallelLimit(reject$1);
-
-  var rejectSeries = doSeries(reject$1);
-
-  function series(tasks, cb) {
-      return _parallel(eachOfSeries, tasks, cb);
-  }
-
-  function retry(times, task, callback) {
-      var DEFAULT_TIMES = 5;
-      var DEFAULT_INTERVAL = 0;
-
-      var attempts = [];
-
-      var opts = {
-          times: DEFAULT_TIMES,
-          interval: DEFAULT_INTERVAL
-      };
-
-      function parseTimes(acc, t) {
-          if (typeof t === 'number') {
-              acc.times = parseInt(t, 10) || DEFAULT_TIMES;
-          } else if (typeof t === 'object') {
-              acc.times = parseInt(t.times, 10) || DEFAULT_TIMES;
-              acc.interval = parseInt(t.interval, 10) || DEFAULT_INTERVAL;
-          } else {
-              throw new Error('Unsupported argument type for \'times\': ' + typeof t);
-          }
-      }
-
-      var length = arguments.length;
-      if (length < 1 || length > 3) {
-          throw new Error('Invalid arguments - must be either (task), (task, callback), (times, task) or (times, task, callback)');
-      } else if (length <= 2 && typeof times === 'function') {
-          callback = task;
-          task = times;
-      }
-      if (typeof times !== 'function') {
-          parseTimes(opts, times);
-      }
-      opts.callback = callback;
-      opts.task = task;
-
-      function wrappedTask(wrappedCallback, wrappedResults) {
-          function retryAttempt(task, finalAttempt) {
-              return function (seriesCallback) {
-                  task(function (err, result) {
-                      seriesCallback(!err || finalAttempt, {
-                          err: err,
-                          result: result
-                      });
-                  }, wrappedResults);
-              };
-          }
-
-          function retryInterval(interval) {
-              return function (seriesCallback) {
-                  setTimeout(function () {
-                      seriesCallback(null);
-                  }, interval);
-              };
-          }
-
-          while (opts.times) {
-
-              var finalAttempt = !(opts.times -= 1);
-              attempts.push(retryAttempt(opts.task, finalAttempt));
-              if (!finalAttempt && opts.interval > 0) {
-                  attempts.push(retryInterval(opts.interval));
-              }
-          }
-
-          series(attempts, function (done, data) {
-              data = data[data.length - 1];
-              (wrappedCallback || opts.callback)(data.err, data.result);
-          });
-      }
-
-      // If a callback is passed, run this as a controll flow
-      return opts.callback ? wrappedTask() : wrappedTask;
-  }
-
-  var some = _createTester(eachOf, Boolean, identity);
-
-  var someLimit = _createTester(eachOfLimit, Boolean, identity);
-
-  function sortBy(arr, iterator, cb) {
-      map(arr, function (x, cb) {
-          iterator(x, function (err, criteria) {
-              if (err) return cb(err);
-              cb(null, { value: x, criteria: criteria });
-          });
-      }, function (err, results) {
-          if (err) return cb(err);
-          cb(null, arrayMap(results.sort(comparator), baseProperty('value')));
-      });
-
-      function comparator(left, right) {
-          var a = left.criteria,
-              b = right.criteria;
-          return a < b ? -1 : a > b ? 1 : 0;
-      }
-  }
-
-  /* Built-in method references for those with the same name as other `lodash` methods. */
-  var nativeCeil = Math.ceil;
-  var nativeMax$2 = Math.max;
-  /**
-   * The base implementation of `_.range` and `_.rangeRight` which doesn't
-   * coerce arguments to numbers.
-   *
-   * @private
-   * @param {number} start The start of the range.
-   * @param {number} end The end of the range.
-   * @param {number} step The value to increment or decrement by.
-   * @param {boolean} [fromRight] Specify iterating from right to left.
-   * @returns {Array} Returns the new array of numbers.
-   */
-  function baseRange(start, end, step, fromRight) {
-    var index = -1,
-        length = nativeMax$2(nativeCeil((end - start) / (step || 1)), 0),
-        result = Array(length);
-
-    while (length--) {
-      result[fromRight ? length : ++index] = start;
-      start += step;
+
+    async.ensureAsync = ensureAsync;
+
+    async.constant = _restParam(function (values) {
+        var args = [null].concat(values);
+        return function (callback) {
+            return callback.apply(this, args);
+        };
+    });
+
+    async.wrapSync = async.asyncify = function asyncify(func) {
+        return _restParam(function (args) {
+            var callback = args.pop();
+            var result;
+            try {
+                result = func.apply(this, args);
+            } catch (e) {
+                return callback(e);
+            }
+            // if result is Promise object
+            if (_isObject(result) && typeof result.then === "function") {
+                result.then(function (value) {
+                    callback(null, value);
+                })["catch"](function (err) {
+                    callback(err.message ? err : new Error(err));
+                });
+            } else {
+                callback(null, result);
+            }
+        });
+    };
+
+    // Node.js
+    if (typeof module === 'object' && module.exports) {
+        module.exports = async;
     }
-    return result;
-  }
-
-  function times (count, iterator, callback) {
-      map(baseRange(0, count, 1), iterator, callback);
-  }
-
-  function timeLimit(count, limit, iterator, cb) {
-      return mapLimit(baseRange(0, count, 1), limit, iterator, cb);
-  }
-
-  function timesSeries (count, iterator, callback) {
-      mapSeries(baseRange(0, count, 1), iterator, callback);
-  }
-
-  function transform(arr, memo, iterator, callback) {
-      if (arguments.length === 3) {
-          callback = iterator;
-          iterator = memo;
-          memo = isArray(arr) ? [] : {};
-      }
-
-      eachOf(arr, function (v, k, cb) {
-          iterator(memo, v, k, cb);
-      }, function (err) {
-          callback(err, memo);
-      });
-  }
-
-  function unmemoize(fn) {
-      return function () {
-          return (fn.unmemoized || fn).apply(null, arguments);
-      };
-  }
-
-  function until(test, iterator, cb) {
-      return whilst(function () {
-          return !test.apply(this, arguments);
-      }, iterator, cb);
-  }
-
-  function waterfall (tasks, cb) {
-      cb = once(cb || noop);
-      if (!isArray(tasks)) return cb(new Error('First argument to waterfall must be an array of functions'));
-      if (!tasks.length) return cb();
-
-      function wrapIterator(iterator) {
-          return rest(function (err, args) {
-              if (err) {
-                  cb.apply(null, [err].concat(args));
-              } else {
-                  var next = iterator.next();
-                  if (next) {
-                      args.push(wrapIterator(next));
-                  } else {
-                      args.push(cb);
-                  }
-                  ensureAsync(iterator).apply(null, args);
-              }
-          });
-      }
-      wrapIterator(iterator(tasks))();
-  }
-
-  var index = {
-      applyEach: applyEach,
-      applyEachSeries: applyEachSeries,
-      apply: apply,
-      asyncify: asyncify,
-      auto: auto,
-      cargo: cargo,
-      compose: compose,
-      concat: concat,
-      concatSeries: concatSeries,
-      constant: constant,
-      detect: detect,
-      detectLimit: detectLimit,
-      detectSeries: detectSeries,
-      dir: dir,
-      doDuring: doDuring,
-      doUntil: doUntil,
-      doWhilst: doWhilst,
-      during: during,
-      each: each,
-      eachLimit: eachLimit,
-      eachOf: eachOf,
-      eachOfLimit: eachOfLimit,
-      eachOfSeries: eachOfSeries,
-      eachSeries: eachSeries,
-      ensureAsync: ensureAsync,
-      every: every,
-      everyLimit: everyLimit,
-      filter: filter,
-      filterLimit: filterLimit,
-      filterSeries: filterSeries,
-      forever: forever,
-      iterator: iterator,
-      log: log,
-      map: map,
-      mapLimit: mapLimit,
-      mapSeries: mapSeries,
-      memoize: memoize,
-      nextTick: nexTick,
-      parallel: parallel,
-      parallelLimit: parallelLimit,
-      priorityQueue: priorityQueue,
-      queue: queue,
-      reduce: reduce,
-      reduceRight: reduceRight,
-      reject: reject,
-      rejectLimit: rejectLimit,
-      rejectSeries: rejectSeries,
-      retry: retry,
-      seq: seq,
-      series: series,
-      setImmediate: setImmediate$1,
-      some: some,
-      someLimit: someLimit,
-      sortBy: sortBy,
-      times: times,
-      timesLimit: timeLimit,
-      timesSeries: timesSeries,
-      transform: transform,
-      unmemoize: unmemoize,
-      until: until,
-      waterfall: waterfall,
-      whilst: whilst,
-
-      // aliases
-      all: every,
-      any: some,
-      forEach: each,
-      forEachSeries: eachSeries,
-      forEachLimit: eachLimit,
-      forEachOf: eachOf,
-      forEachOfSeries: eachOfSeries,
-      forEachOfLimit: eachOfLimit,
-      inject: reduce,
-      foldl: reduce,
-      foldr: reduceRight,
-      select: filter,
-      selectLimit: filterLimit,
-      selectSeries: filterSeries,
-      wrapSync: asyncify
-  };
-
-  exports['default'] = index;
-  exports.applyEach = applyEach;
-  exports.applyEachSeries = applyEachSeries;
-  exports.apply = apply;
-  exports.asyncify = asyncify;
-  exports.auto = auto;
-  exports.cargo = cargo;
-  exports.compose = compose;
-  exports.concat = concat;
-  exports.concatSeries = concatSeries;
-  exports.constant = constant;
-  exports.detect = detect;
-  exports.detectLimit = detectLimit;
-  exports.detectSeries = detectSeries;
-  exports.dir = dir;
-  exports.doDuring = doDuring;
-  exports.doUntil = doUntil;
-  exports.doWhilst = doWhilst;
-  exports.during = during;
-  exports.each = each;
-  exports.eachLimit = eachLimit;
-  exports.eachOf = eachOf;
-  exports.eachOfLimit = eachOfLimit;
-  exports.eachOfSeries = eachOfSeries;
-  exports.eachSeries = eachSeries;
-  exports.ensureAsync = ensureAsync;
-  exports.every = every;
-  exports.everyLimit = everyLimit;
-  exports.filter = filter;
-  exports.filterLimit = filterLimit;
-  exports.filterSeries = filterSeries;
-  exports.forever = forever;
-  exports.iterator = iterator;
-  exports.log = log;
-  exports.map = map;
-  exports.mapLimit = mapLimit;
-  exports.mapSeries = mapSeries;
-  exports.memoize = memoize;
-  exports.nextTick = nexTick;
-  exports.parallel = parallel;
-  exports.parallelLimit = parallelLimit;
-  exports.priorityQueue = priorityQueue;
-  exports.queue = queue;
-  exports.reduce = reduce;
-  exports.reduceRight = reduceRight;
-  exports.reject = reject;
-  exports.rejectLimit = rejectLimit;
-  exports.rejectSeries = rejectSeries;
-  exports.retry = retry;
-  exports.seq = seq;
-  exports.series = series;
-  exports.setImmediate = setImmediate$1;
-  exports.some = some;
-  exports.someLimit = someLimit;
-  exports.sortBy = sortBy;
-  exports.times = times;
-  exports.timesLimit = timeLimit;
-  exports.timesSeries = timesSeries;
-  exports.transform = transform;
-  exports.unmemoize = unmemoize;
-  exports.until = until;
-  exports.waterfall = waterfall;
-  exports.whilst = whilst;
-  exports.all = every;
-  exports.any = some;
-  exports.forEach = each;
-  exports.forEachSeries = eachSeries;
-  exports.forEachLimit = eachLimit;
-  exports.forEachOf = eachOf;
-  exports.forEachOfSeries = eachOfSeries;
-  exports.forEachOfLimit = eachOfLimit;
-  exports.inject = reduce;
-  exports.foldl = reduce;
-  exports.foldr = reduceRight;
-  exports.select = filter;
-  exports.selectLimit = filterLimit;
-  exports.selectSeries = filterSeries;
-  exports.wrapSync = asyncify;
-
-}));
\ No newline at end of file
+    // AMD / RequireJS
+    else if (typeof define === 'function' && define.amd) {
+            define([], function () {
+                return async;
+            });
+        }
+        // included directly via <script> tag
+        else {
+                root.async = async;
+            }
+})();
\ No newline at end of file
diff --git a/build/async.min.js b/build/async.min.js
index 1b8ab3b..4af1f6b 100644
--- a/build/async.min.js
+++ b/build/async.min.js
@@ -1,2 +1,2 @@
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diff --git a/build/auto.js b/build/auto.js
index 51f7d10..26046a7 100644
--- a/build/auto.js
+++ b/build/auto.js
@@ -22,6 +22,7 @@ exports.default = function (tasks, concurrency, callback) {
 
     var results = {};
     var runningTasks = 0;
+    var hasError = false;
 
     var listeners = [];
     function addListener(fn) {
@@ -45,6 +46,7 @@ exports.default = function (tasks, concurrency, callback) {
     });
 
     (0, _arrayEach2.default)(keys, function (k) {
+        if (hasError) return;
         var task = (0, _isArray2.default)(tasks[k]) ? tasks[k] : [tasks[k]];
         var taskCallback = (0, _rest2.default)(function (err, args) {
             runningTasks--;
@@ -57,6 +59,8 @@ exports.default = function (tasks, concurrency, callback) {
                     safeResults[rkey] = val;
                 });
                 safeResults[k] = args;
+                hasError = true;
+
                 callback(err, safeResults);
             } else {
                 results[k] = args;
@@ -69,7 +73,7 @@ exports.default = function (tasks, concurrency, callback) {
         var dep;
         while (len--) {
             if (!(dep = tasks[requires[len]])) {
-                throw new Error('Has inexistant dependency');
+                throw new Error('Has non-existent dependency in ' + requires.join(', '));
             }
             if ((0, _isArray2.default)(dep) && (0, _indexOf2.default)(dep, k) >= 0) {
                 throw new Error('Has cyclic dependencies');
diff --git a/build/es/auto.js b/build/es/auto.js
index 8b01ac5..ad5d081 100644
--- a/build/es/auto.js
+++ b/build/es/auto.js
@@ -31,6 +31,7 @@ export default function (tasks, concurrency, callback) {
 
     var results = {};
     var runningTasks = 0;
+    var hasError = false;
 
     var listeners = [];
     function addListener(fn) {
@@ -54,6 +55,7 @@ export default function (tasks, concurrency, callback) {
     });
 
     arrayEach(keys, function (k) {
+        if (hasError) return;
         var task = isArray(tasks[k]) ? tasks[k]: [tasks[k]];
         var taskCallback = rest(function(err, args) {
             runningTasks--;
@@ -66,6 +68,8 @@ export default function (tasks, concurrency, callback) {
                     safeResults[rkey] = val;
                 });
                 safeResults[k] = args;
+                hasError = true;
+
                 callback(err, safeResults);
             }
             else {
@@ -79,7 +83,8 @@ export default function (tasks, concurrency, callback) {
         var dep;
         while (len--) {
             if (!(dep = tasks[requires[len]])) {
-                throw new Error('Has inexistant dependency');
+                throw new Error('Has non-existent dependency in ' +
+                    requires.join(', '));
             }
             if (isArray(dep) && indexOf(dep, k) >= 0) {
                 throw new Error('Has cyclic dependencies');
diff --git a/build/es/memoize.js b/build/es/memoize.js
index 184f0d6..cbfde31 100644
--- a/build/es/memoize.js
+++ b/build/es/memoize.js
@@ -2,6 +2,7 @@
 
 import identity from 'lodash-es/identity';
 import rest from 'lodash-es/rest';
+import has from 'lodash-es/has';
 
 import setImmediate from './internal/setImmediate';
 
@@ -12,11 +13,11 @@ export default function memoize(fn, hasher) {
     var memoized = rest(function memoized(args) {
         var callback = args.pop();
         var key = hasher.apply(null, args);
-        if (key in memo) {
+        if (has(memo, key)) {
             setImmediate(function() {
                 callback.apply(null, memo[key]);
             });
-        } else if (key in queues) {
+        } else if (has(queues, key)) {
             queues[key].push(callback);
         } else {
             queues[key] = [callback];
diff --git a/build/memoize.js b/build/memoize.js
index 3436f42..1027afb 100644
--- a/build/memoize.js
+++ b/build/memoize.js
@@ -13,6 +13,10 @@ var _rest = require('lodash/rest');
 
 var _rest2 = _interopRequireDefault(_rest);
 
+var _has = require('lodash/has');
+
+var _has2 = _interopRequireDefault(_has);
+
 var _setImmediate = require('./internal/setImmediate');
 
 var _setImmediate2 = _interopRequireDefault(_setImmediate);
@@ -26,11 +30,11 @@ function memoize(fn, hasher) {
     var memoized = (0, _rest2.default)(function memoized(args) {
         var callback = args.pop();
         var key = hasher.apply(null, args);
-        if (key in memo) {
+        if ((0, _has2.default)(memo, key)) {
             (0, _setImmediate2.default)(function () {
                 callback.apply(null, memo[key]);
             });
-        } else if (key in queues) {
+        } else if ((0, _has2.default)(queues, key)) {
             queues[key].push(callback);
         } else {
             queues[key] = [callback];
diff --git a/build/package.json b/build/package.json
index df61779..6d4ea75 100644
--- a/build/package.json
+++ b/build/package.json
@@ -72,7 +72,7 @@
   "jam": {
     "main": "index.js",
     "include": [
-      "build/async.js",
+      "dist/async.js",
       "README.md",
       "LICENSE"
     ],
diff --git a/dist/async.js b/dist/async.js
index 31e7620..034bf70 100644
--- a/dist/async.js
+++ b/dist/async.js
@@ -1,8 +1,10 @@
+'use strict';
+
 /*!
  * async
  * https://github.com/caolan/async
  *
- * Copyright 2010-2014 Caolan McMahon
+ * Copyright 2010-2016 Caolan McMahon
  * Released under the MIT license
  */
 (function () {
@@ -25,9 +27,7 @@
     // Establish the root object, `window` (`self`) in the browser, `global`
     // on the server, or `this` in some virtual machines. We use `self`
     // instead of `window` for `WebWorker` support.
-    var root = typeof self === 'object' && self.self === self && self ||
-            typeof global === 'object' && global.global === global && global ||
-            this;
+    var root = typeof self === 'object' && self.self === self && self || typeof global === 'object' && global.global === global && global || this;
 
     if (root != null) {
         previous_async = root.async;
@@ -39,7 +39,7 @@
     };
 
     function only_once(fn) {
-        return function() {
+        return function () {
             if (fn === null) throw new Error("Callback was already called.");
             fn.apply(this, arguments);
             fn = null;
@@ -47,7 +47,7 @@
     }
 
     function _once(fn) {
-        return function() {
+        return function () {
             if (fn === null) return;
             fn.apply(this, arguments);
             fn = null;
@@ -63,18 +63,15 @@
     };
 
     // Ported from underscore.js isObject
-    var _isObject = function(obj) {
+    var _isObject = function (obj) {
         var type = typeof obj;
         return type === 'function' || type === 'object' && !!obj;
     };
 
     function _isArrayLike(arr) {
-        return _isArray(arr) || (
-            // has a positive integer length property
-            typeof arr.length === "number" &&
-            arr.length >= 0 &&
-            arr.length % 1 === 0
-        );
+        return _isArray(arr) ||
+        // has a positive integer length property
+        typeof arr.length === "number" && arr.length >= 0 && arr.length % 1 === 0;
     }
 
     function _arrayEach(arr, iterator) {
@@ -98,7 +95,9 @@
     }
 
     function _range(count) {
-        return _map(Array(count), function (v, i) { return i; });
+        return _map(Array(count), function (v, i) {
+            return i;
+        });
     }
 
     function _reduce(arr, iterator, memo) {
@@ -156,15 +155,17 @@
     // From underscore.js (https://github.com/jashkenas/underscore/pull/2140).
     function _restParam(func, startIndex) {
         startIndex = startIndex == null ? func.length - 1 : +startIndex;
-        return function() {
+        return function () {
             var length = Math.max(arguments.length - startIndex, 0);
             var rest = Array(length);
             for (var index = 0; index < length; index++) {
                 rest[index] = arguments[index + startIndex];
             }
             switch (startIndex) {
-                case 0: return func.call(this, rest);
-                case 1: return func.call(this, arguments[0], rest);
+                case 0:
+                    return func.call(this, rest);
+                case 1:
+                    return func.call(this, arguments[0], rest);
             }
             // Currently unused but handle cases outside of the switch statement:
             // var args = Array(startIndex + 1);
@@ -189,10 +190,10 @@
     // capture the global reference to guard against fakeTimer mocks
     var _setImmediate = typeof setImmediate === 'function' && setImmediate;
 
-    var _delay = _setImmediate ? function(fn) {
+    var _delay = _setImmediate ? function (fn) {
         // not a direct alias for IE10 compatibility
         _setImmediate(fn);
-    } : function(fn) {
+    } : function (fn) {
         setTimeout(fn, 0);
     };
 
@@ -203,30 +204,25 @@
     }
     async.setImmediate = _setImmediate ? _delay : async.nextTick;
 
-
-    async.forEach =
-    async.each = function (arr, iterator, callback) {
+    async.forEach = async.each = function (arr, iterator, callback) {
         return async.eachOf(arr, _withoutIndex(iterator), callback);
     };
 
-    async.forEachSeries =
-    async.eachSeries = function (arr, iterator, callback) {
+    async.forEachSeries = async.eachSeries = function (arr, iterator, callback) {
         return async.eachOfSeries(arr, _withoutIndex(iterator), callback);
     };
 
-
-    async.forEachLimit =
-    async.eachLimit = function (arr, limit, iterator, callback) {
+    async.forEachLimit = async.eachLimit = function (arr, limit, iterator, callback) {
         return _eachOfLimit(limit)(arr, _withoutIndex(iterator), callback);
     };
 
-    async.forEachOf =
-    async.eachOf = function (object, iterator, callback) {
+    async.forEachOf = async.eachOf = function (object, iterator, callback) {
         callback = _once(callback || noop);
         object = object || [];
 
         var iter = _keyIterator(object);
-        var key, completed = 0;
+        var key,
+            completed = 0;
 
         while ((key = iter()) != null) {
             completed += 1;
@@ -243,13 +239,12 @@
             // Check key is null in case iterator isn't exhausted
             // and done resolved synchronously.
             else if (key === null && completed <= 0) {
-                callback(null);
-            }
+                    callback(null);
+                }
         }
     };
 
-    async.forEachOfSeries =
-    async.eachOfSeries = function (obj, iterator, callback) {
+    async.forEachOfSeries = async.eachOfSeries = function (obj, iterator, callback) {
         callback = _once(callback || noop);
         obj = obj || [];
         var nextKey = _keyIterator(obj);
@@ -262,8 +257,7 @@
             iterator(obj[key], key, only_once(function (err) {
                 if (err) {
                     callback(err);
-                }
-                else {
+                } else {
                     key = nextKey();
                     if (key === null) {
                         return callback(null);
@@ -281,10 +275,7 @@
         iterate();
     };
 
-
-
-    async.forEachOfLimit =
-    async.eachOfLimit = function (obj, limit, iterator, callback) {
+    async.forEachOfLimit = async.eachOfLimit = function (obj, limit, iterator, callback) {
         _eachOfLimit(limit)(obj, iterator, callback);
     };
 
@@ -301,7 +292,7 @@
             var running = 0;
             var errored = false;
 
-            (function replenish () {
+            (function replenish() {
                 if (done && running <= 0) {
                     return callback(null);
                 }
@@ -321,8 +312,7 @@
                         if (err) {
                             callback(err);
                             errored = true;
-                        }
-                        else {
+                        } else {
                             replenish();
                         }
                     }));
@@ -331,7 +321,6 @@
         };
     }
 
-
     function doParallel(fn) {
         return function (obj, iterator, callback) {
             return fn(async.eachOf, obj, iterator, callback);
@@ -368,9 +357,7 @@
 
     // reduce only has a series version, as doing reduce in parallel won't
     // work in many situations.
-    async.inject =
-    async.foldl =
-    async.reduce = function (arr, memo, iterator, callback) {
+    async.inject = async.foldl = async.reduce = function (arr, memo, iterator, callback) {
         async.eachOfSeries(arr, function (x, i, callback) {
             iterator(memo, x, function (err, v) {
                 memo = v;
@@ -381,8 +368,7 @@
         });
     };
 
-    async.foldr =
-    async.reduceRight = function (arr, memo, iterator, callback) {
+    async.foldr = async.reduceRight = function (arr, memo, iterator, callback) {
         var reversed = _map(arr, identity).reverse();
         async.reduce(reversed, memo, iterator, callback);
     };
@@ -394,9 +380,9 @@
             memo = _isArray(arr) ? [] : {};
         }
 
-        async.eachOf(arr, function(v, k, cb) {
+        async.eachOf(arr, function (v, k, cb) {
             iterator(memo, v, k, cb);
-        }, function(err) {
+        }, function (err) {
             callback(err, memo);
         });
     };
@@ -406,7 +392,7 @@
         eachfn(arr, function (x, index, callback) {
             iterator(x, function (v) {
                 if (v) {
-                    results.push({index: index, value: x});
+                    results.push({ index: index, value: x });
                 }
                 callback();
             });
@@ -419,18 +405,15 @@
         });
     }
 
-    async.select =
-    async.filter = doParallel(_filter);
+    async.select = async.filter = doParallel(_filter);
 
-    async.selectLimit =
-    async.filterLimit = doParallelLimit(_filter);
+    async.selectLimit = async.filterLimit = doParallelLimit(_filter);
 
-    async.selectSeries =
-    async.filterSeries = doSeries(_filter);
+    async.selectSeries = async.filterSeries = doSeries(_filter);
 
     function _reject(eachfn, arr, iterator, callback) {
-        _filter(eachfn, arr, function(value, cb) {
-            iterator(value, function(v) {
+        _filter(eachfn, arr, function (value, cb) {
+            iterator(value, function (v) {
                 cb(!v);
             });
         }, callback);
@@ -440,7 +423,7 @@
     async.rejectSeries = doSeries(_reject);
 
     function _createTester(eachfn, check, getResult) {
-        return function(arr, limit, iterator, cb) {
+        return function (arr, limit, iterator, cb) {
             function done() {
                 if (cb) cb(getResult(false, void 0));
             }
@@ -464,13 +447,11 @@
         };
     }
 
-    async.any =
-    async.some = _createTester(async.eachOf, toBool, identity);
+    async.any = async.some = _createTester(async.eachOf, toBool, identity);
 
     async.someLimit = _createTester(async.eachOfLimit, toBool, identity);
 
-    async.all =
-    async.every = _createTester(async.eachOf, notId, notId);
+    async.all = async.every = _createTester(async.eachOf, notId, notId);
 
     async.everyLimit = _createTester(async.eachOfLimit, notId, notId);
 
@@ -486,25 +467,23 @@
             iterator(x, function (err, criteria) {
                 if (err) {
                     callback(err);
-                }
-                else {
-                    callback(null, {value: x, criteria: criteria});
+                } else {
+                    callback(null, { value: x, criteria: criteria });
                 }
             });
         }, function (err, results) {
             if (err) {
                 return callback(err);
-            }
-            else {
+            } else {
                 callback(null, _map(results.sort(comparator), function (x) {
                     return x.value;
                 }));
             }
-
         });
 
         function comparator(left, right) {
-            var a = left.criteria, b = right.criteria;
+            var a = left.criteria,
+                b = right.criteria;
             return a < b ? -1 : a > b ? 1 : 0;
         }
     };
@@ -553,23 +532,22 @@
 
         _arrayEach(keys, function (k) {
             if (hasError) return;
-            var task = _isArray(tasks[k]) ? tasks[k]: [tasks[k]];
-            var taskCallback = _restParam(function(err, args) {
+            var task = _isArray(tasks[k]) ? tasks[k] : [tasks[k]];
+            var taskCallback = _restParam(function (err, args) {
                 runningTasks--;
                 if (args.length <= 1) {
                     args = args[0];
                 }
                 if (err) {
                     var safeResults = {};
-                    _forEachOf(results, function(val, rkey) {
+                    _forEachOf(results, function (val, rkey) {
                         safeResults[rkey] = val;
                     });
                     safeResults[k] = args;
                     hasError = true;
 
                     callback(err, safeResults);
-                }
-                else {
+                } else {
                     results[k] = args;
                     async.setImmediate(taskComplete);
                 }
@@ -588,14 +566,13 @@
             }
             function ready() {
                 return runningTasks < concurrency && _reduce(requires, function (a, x) {
-                    return (a && results.hasOwnProperty(x));
+                    return a && results.hasOwnProperty(x);
                 }, true) && !results.hasOwnProperty(k);
             }
             if (ready()) {
                 runningTasks++;
                 task[task.length - 1](taskCallback, results);
-            }
-            else {
+            } else {
                 addListener(listener);
             }
             function listener() {
@@ -608,9 +585,7 @@
         });
     };
 
-
-
-    async.retry = function(times, task, callback) {
+    async.retry = function (times, task, callback) {
         var DEFAULT_TIMES = 5;
         var DEFAULT_INTERVAL = 0;
 
@@ -621,10 +596,10 @@
             interval: DEFAULT_INTERVAL
         };
 
-        function parseTimes(acc, t){
-            if(typeof t === 'number'){
+        function parseTimes(acc, t) {
+            if (typeof t === 'number') {
                 acc.times = parseInt(t, 10) || DEFAULT_TIMES;
-            } else if(typeof t === 'object'){
+            } else if (typeof t === 'object') {
                 acc.times = parseInt(t.times, 10) || DEFAULT_TIMES;
                 acc.interval = parseInt(t.interval, 10) || DEFAULT_INTERVAL;
             } else {
@@ -647,16 +622,16 @@
 
         function wrappedTask(wrappedCallback, wrappedResults) {
             function retryAttempt(task, finalAttempt) {
-                return function(seriesCallback) {
-                    task(function(err, result){
-                        seriesCallback(!err || finalAttempt, {err: err, result: result});
+                return function (seriesCallback) {
+                    task(function (err, result) {
+                        seriesCallback(!err || finalAttempt, { err: err, result: result });
                     }, wrappedResults);
                 };
             }
 
-            function retryInterval(interval){
-                return function(seriesCallback){
-                    setTimeout(function(){
+            function retryInterval(interval) {
+                return function (seriesCallback) {
+                    setTimeout(function () {
                         seriesCallback(null);
                     }, interval);
                 };
@@ -664,14 +639,14 @@
 
             while (opts.times) {
 
-                var finalAttempt = !(opts.times-=1);
+                var finalAttempt = !(opts.times -= 1);
                 attempts.push(retryAttempt(opts.task, finalAttempt));
-                if(!finalAttempt && opts.interval > 0){
+                if (!finalAttempt && opts.interval > 0) {
                     attempts.push(retryInterval(opts.interval));
                 }
             }
 
-            async.series(attempts, function(done, data){
+            async.series(attempts, function (done, data) {
                 data = data[data.length - 1];
                 (wrappedCallback || opts.callback)(data.err, data.result);
             });
@@ -694,13 +669,11 @@
             return _restParam(function (err, args) {
                 if (err) {
                     callback.apply(null, [err].concat(args));
-                }
-                else {
+                } else {
                     var next = iterator.next();
                     if (next) {
                         args.push(wrapIterator(next));
-                    }
-                    else {
+                    } else {
                         args.push(callback);
                     }
                     ensureAsync(iterator).apply(null, args);
@@ -731,11 +704,11 @@
         _parallel(async.eachOf, tasks, callback);
     };
 
-    async.parallelLimit = function(tasks, limit, callback) {
+    async.parallelLimit = function (tasks, limit, callback) {
         _parallel(_eachOfLimit(limit), tasks, callback);
     };
 
-    async.series = function(tasks, callback) {
+    async.series = function (tasks, callback) {
         _parallel(async.eachOfSeries, tasks, callback);
     };
 
@@ -748,7 +721,7 @@
                 return fn.next();
             }
             fn.next = function () {
-                return (index < tasks.length - 1) ? makeCallback(index + 1): null;
+                return index < tasks.length - 1 ? makeCallback(index + 1) : null;
             };
             return fn;
         }
@@ -757,9 +730,7 @@
 
     async.apply = _restParam(function (fn, args) {
         return _restParam(function (callArgs) {
-            return fn.apply(
-                null, args.concat(callArgs)
-            );
+            return fn.apply(null, args.concat(callArgs));
         });
     });
 
@@ -780,7 +751,7 @@
     async.whilst = function (test, iterator, callback) {
         callback = callback || noop;
         if (test()) {
-            var next = _restParam(function(err, args) {
+            var next = _restParam(function (err, args) {
                 if (err) {
                     callback(err);
                 } else if (test.apply(this, args)) {
@@ -797,19 +768,19 @@
 
     async.doWhilst = function (iterator, test, callback) {
         var calls = 0;
-        return async.whilst(function() {
+        return async.whilst(function () {
             return ++calls <= 1 || test.apply(this, arguments);
         }, iterator, callback);
     };
 
     async.until = function (test, iterator, callback) {
-        return async.whilst(function() {
+        return async.whilst(function () {
             return !test.apply(this, arguments);
         }, iterator, callback);
     };
 
     async.doUntil = function (iterator, test, callback) {
-        return async.doWhilst(iterator, function() {
+        return async.doWhilst(iterator, function () {
             return !test.apply(this, arguments);
         }, callback);
     };
@@ -817,7 +788,7 @@
     async.during = function (test, iterator, callback) {
         callback = callback || noop;
 
-        var next = _restParam(function(err, args) {
+        var next = _restParam(function (err, args) {
             if (err) {
                 callback(err);
             } else {
@@ -826,7 +797,7 @@
             }
         });
 
-        var check = function(err, truth) {
+        var check = function (err, truth) {
             if (err) {
                 callback(err);
             } else if (truth) {
@@ -841,7 +812,7 @@
 
     async.doDuring = function (iterator, test, callback) {
         var calls = 0;
-        async.during(function(next) {
+        async.during(function (next) {
             if (calls++ < 1) {
                 next(null, true);
             } else {
@@ -853,8 +824,7 @@
     function _queue(worker, concurrency, payload) {
         if (concurrency == null) {
             concurrency = 1;
-        }
-        else if(concurrency === 0) {
+        } else if (concurrency === 0) {
             throw new Error('Concurrency must not be zero');
         }
         function _insert(q, data, pos, callback) {
@@ -865,13 +835,13 @@
             if (!_isArray(data)) {
                 data = [data];
             }
-            if(data.length === 0 && q.idle()) {
+            if (data.length === 0 && q.idle()) {
                 // call drain immediately if there are no tasks
-                return async.setImmediate(function() {
+                return async.setImmediate(function () {
                     q.drain();
                 });
             }
-            _arrayEach(data, function(task) {
+            _arrayEach(data, function (task) {
                 var item = {
                     data: task,
                     callback: callback || noop
@@ -890,7 +860,7 @@
             async.setImmediate(q.process);
         }
         function _next(q, tasks) {
-            return function(){
+            return function () {
                 workers -= 1;
 
                 var removed = false;
@@ -934,11 +904,9 @@
                 _insert(q, data, true, callback);
             },
             process: function () {
-                while(!q.paused && workers < q.concurrency && q.tasks.length){
+                while (!q.paused && workers < q.concurrency && q.tasks.length) {
 
-                    var tasks = q.payload ?
-                        q.tasks.splice(0, q.payload) :
-                        q.tasks.splice(0, q.tasks.length);
+                    var tasks = q.payload ? q.tasks.splice(0, q.payload) : q.tasks.splice(0, q.tasks.length);
 
                     var data = _map(tasks, function (task) {
                         return task.data;
@@ -962,14 +930,16 @@
             workersList: function () {
                 return workersList;
             },
-            idle: function() {
+            idle: function () {
                 return q.tasks.length + workers === 0;
             },
             pause: function () {
                 q.paused = true;
             },
             resume: function () {
-                if (q.paused === false) { return; }
+                if (q.paused === false) {
+                    return;
+                }
                 q.paused = false;
                 var resumeCount = Math.min(q.concurrency, q.tasks.length);
                 // Need to call q.process once per concurrent
@@ -992,7 +962,7 @@
 
     async.priorityQueue = function (worker, concurrency) {
 
-        function _compareTasks(a, b){
+        function _compareTasks(a, b) {
             return a.priority - b.priority;
         }
 
@@ -1000,7 +970,7 @@
             var beg = -1,
                 end = sequence.length - 1;
             while (beg < end) {
-                var mid = beg + ((end - beg + 1) >>> 1);
+                var mid = beg + (end - beg + 1 >>> 1);
                 if (compare(item, sequence[mid]) >= 0) {
                     beg = mid;
                 } else {
@@ -1018,13 +988,13 @@
             if (!_isArray(data)) {
                 data = [data];
             }
-            if(data.length === 0) {
+            if (data.length === 0) {
                 // call drain immediately if there are no tasks
-                return async.setImmediate(function() {
+                return async.setImmediate(function () {
                     q.drain();
                 });
             }
-            _arrayEach(data, function(task) {
+            _arrayEach(data, function (task) {
                 var item = {
                     data: task,
                     priority: priority,
@@ -1066,8 +1036,7 @@
                         if (console.error) {
                             console.error(err);
                         }
-                    }
-                    else if (console[name]) {
+                    } else if (console[name]) {
                         _arrayEach(args, function (x) {
                             console[name](x);
                         });
@@ -1090,15 +1059,13 @@
         var memoized = _restParam(function memoized(args) {
             var callback = args.pop();
             var key = hasher.apply(null, args);
-            if (has.call(memo, key)) {   
+            if (has.call(memo, key)) {
                 async.setImmediate(function () {
                     callback.apply(null, memo[key]);
                 });
-            }
-            else if (has.call(queues, key)) {
+            } else if (has.call(queues, key)) {
                 queues[key].push(callback);
-            }
-            else {
+            } else {
                 queues[key] = [callback];
                 fn.apply(null, args.concat([_restParam(function (args) {
                     memo[key] = args;
@@ -1133,7 +1100,7 @@
         return async.mapLimit(_range(count), limit, iterator, callback);
     };
 
-    async.seq = function (/* functions... */) {
+    async.seq = function () /* functions... */{
         var fns = arguments;
         return _restParam(function (args) {
             var that = this;
@@ -1149,32 +1116,28 @@
                 fn.apply(that, newargs.concat([_restParam(function (err, nextargs) {
                     cb(err, nextargs);
                 })]));
-            },
-            function (err, results) {
+            }, function (err, results) {
                 callback.apply(that, [err].concat(results));
             });
         });
     };
 
-    async.compose = function (/* functions... */) {
+    async.compose = function () /* functions... */{
         return async.seq.apply(null, Array.prototype.reverse.call(arguments));
     };
 
-
     function _applyEach(eachfn) {
-        return _restParam(function(fns, args) {
-            var go = _restParam(function(args) {
+        return _restParam(function (fns, args) {
+            var go = _restParam(function (args) {
                 var that = this;
                 var callback = args.pop();
                 return eachfn(fns, function (fn, _, cb) {
                     fn.apply(that, args.concat([cb]));
-                },
-                callback);
+                }, callback);
             });
             if (args.length) {
                 return go.apply(this, args);
-            }
-            else {
+            } else {
                 return go;
             }
         });
@@ -1183,7 +1146,6 @@
     async.applyEach = _applyEach(async.eachOf);
     async.applyEachSeries = _applyEach(async.eachOfSeries);
 
-
     async.forever = function (fn, callback) {
         var done = only_once(callback || noop);
         var task = ensureAsync(fn);
@@ -1217,15 +1179,14 @@
 
     async.ensureAsync = ensureAsync;
 
-    async.constant = _restParam(function(values) {
+    async.constant = _restParam(function (values) {
         var args = [null].concat(values);
         return function (callback) {
             return callback.apply(this, args);
         };
     });
 
-    async.wrapSync =
-    async.asyncify = function asyncify(func) {
+    async.wrapSync = async.asyncify = function asyncify(func) {
         return _restParam(function (args) {
             var callback = args.pop();
             var result;
@@ -1236,9 +1197,9 @@
             }
             // if result is Promise object
             if (_isObject(result) && typeof result.then === "function") {
-                result.then(function(value) {
+                result.then(function (value) {
                     callback(null, value);
-                })["catch"](function(err) {
+                })["catch"](function (err) {
                     callback(err.message ? err : new Error(err));
                 });
             } else {
@@ -1253,13 +1214,12 @@
     }
     // AMD / RequireJS
     else if (typeof define === 'function' && define.amd) {
-        define([], function () {
-            return async;
-        });
-    }
-    // included directly via <script> tag
-    else {
-        root.async = async;
-    }
-
-}());
+            define([], function () {
+                return async;
+            });
+        }
+        // included directly via <script> tag
+        else {
+                root.async = async;
+            }
+})();
\ No newline at end of file
diff --git a/dist/async.min.js b/dist/async.min.js
index 2490016..4af1f6b 100644
--- a/dist/async.min.js
+++ b/dist/async.min.js
@@ -1,2 +1,2 @@
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\ No newline at end of file
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