doc: git mv to .md

* doc: rename .markdown references in content
* doc: rename to .md in tools
* doc: rename to .md in CONTRIBUTING.md

PR-URL: https://github.com/nodejs/node/pull/4747
Reviewed-By: Myles Borins <myles.borins@gmail.com>
Reviewed-By: techjeffharris
Reviewed-By: Johan Bergström <bugs@bergstroem.nu>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>

1 files changed, 211 insertions, 0 deletions

diff --git a/doc/api/globals.md b/doc/api/globals.md
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+# Global Objects
+
+<!-- type=misc -->
+
+These objects are available in all modules. Some of these objects aren't
+actually in the global scope but in the module scope - this will be noted.
+
+## Class: Buffer
+
+<!-- type=global -->
+
+* {Function}
+
+Used to handle binary data. See the [buffer section][].
+
+## \_\_dirname
+
+<!-- type=var -->
+
+* {String}
+
+The name of the directory that the currently executing script resides in.
+
+Example: running `node example.js` from `/Users/mjr`
+
+```js
+console.log(__dirname);
+// /Users/mjr
+```
+
+`__dirname` isn't actually a global but rather local to each module.
+
+For instance, given two modules: `a` and `b`, where `b` is a dependency of
+`a` and there is a directory structure of:
+
+* `/Users/mjr/app/a.js`
+* `/Users/mjr/app/node_modules/b/b.js`
+
+References to `__dirname` within `b.js` will return
+`/Users/mjr/app/node_modules/b` while references to `__dirname` within `a.js`
+will return `/Users/mj/app`.
+
+## \_\_filename
+
+<!-- type=var -->
+
+* {String}
+
+The filename of the code being executed.  This is the resolved absolute path
+of this code file.  For a main program this is not necessarily the same
+filename used in the command line.  The value inside a module is the path
+to that module file.
+
+Example: running `node example.js` from `/Users/mjr`
+
+```js
+console.log(__filename);
+// /Users/mjr/example.js
+```
+
+`__filename` isn't actually a global but rather local to each module.
+
+## clearImmediate(immediateObject)
+
+<!--type=global-->
+
+[`clearImmediate`] is described in the [timers][] section.
+
+## clearInterval(intervalObject)
+
+<!--type=global-->
+
+[`clearInterval`] is described in the [timers][] section.
+
+## clearTimeout(timeoutObject)
+
+<!--type=global-->
+
+[`clearTimeout`] is described in the [timers][] section.
+
+## console
+
+<!-- type=global -->
+
+* {Object}
+
+Used to print to stdout and stderr. See the [`console`][] section.
+
+## exports
+
+<!-- type=var -->
+
+A reference to the `module.exports` that is shorter to type.
+See [module system documentation][] for details on when to use `exports` and
+when to use `module.exports`.
+
+`exports` isn't actually a global but rather local to each module.
+
+See the [module system documentation][] for more information.
+
+## global
+
+<!-- type=global -->
+
+* {Object} The global namespace object.
+
+In browsers, the top-level scope is the global scope. That means that in
+browsers if you're in the global scope `var something` will define a global
+variable. In Node.js this is different. The top-level scope is not the global
+scope; `var something` inside an Node.js module will be local to that module.
+
+## module
+
+<!-- type=var -->
+
+* {Object}
+
+A reference to the current module. In particular
+`module.exports` is used for defining what a module exports and makes
+available through `require()`.
+
+`module` isn't actually a global but rather local to each module.
+
+See the [module system documentation][] for more information.
+
+## process
+
+<!-- type=global -->
+
+* {Object}
+
+The process object. See the [`process` object][] section.
+
+## require()
+
+<!-- type=var -->
+
+* {Function}
+
+To require modules. See the [Modules][] section.  `require` isn't actually a
+global but rather local to each module.
+
+### require.cache
+
+* {Object}
+
+Modules are cached in this object when they are required. By deleting a key
+value from this object, the next `require` will reload the module. Note that
+this does not apply to [native addons][], for which reloading will result in an
+Error.
+
+### require.extensions
+
+    Stability: 0 - Deprecated
+
+* {Object}
+
+Instruct `require` on how to handle certain file extensions.
+
+Process files with the extension `.sjs` as `.js`:
+
+```js
+require.extensions['.sjs'] = require.extensions['.js'];
+```
+
+**Deprecated**  In the past, this list has been used to load
+non-JavaScript modules into Node.js by compiling them on-demand.
+However, in practice, there are much better ways to do this, such as
+loading modules via some other Node.js program, or compiling them to
+JavaScript ahead of time.
+
+Since the Module system is locked, this feature will probably never go
+away.  However, it may have subtle bugs and complexities that are best
+left untouched.
+
+### require.resolve()
+
+Use the internal `require()` machinery to look up the location of a module,
+but rather than loading the module, just return the resolved filename.
+
+## setImmediate(callback[, arg][, ...])
+
+<!-- type=global -->
+
+[`setImmediate`] is described in the [timers][] section.
+
+## setInterval(callback, delay[, arg][, ...])
+
+<!-- type=global -->
+
+[`setInterval`] is described in the [timers][] section.
+
+## setTimeout(callback, delay[, arg][, ...])
+
+<!-- type=global -->
+
+[`setTimeout`] is described in the [timers][] section.
+
+[`console`]: console.html
+[`process` object]: process.html#process_process
+[buffer section]: buffer.html
+[module system documentation]: modules.html
+[Modules]: modules.html#modules_modules
+[native addons]: addons.html
+[timers]: timers.html
+[`clearImmediate`]: timers.html#timers_clearimmediate_immediateobject
+[`clearInterval`]: timers.html#timers_clearinterval_intervalobject
+[`clearTimeout`]: timers.html#timers_cleartimeout_timeoutobject
+[`setImmediate`]: timers.html#timers_setimmediate_callback_arg
+[`setInterval`]: timers.html#timers_setinterval_callback_delay_arg
+[`setTimeout`]: timers.html#timers_settimeout_callback_delay_arg