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diff --git a/bin/lib/less/cssmin.js b/bin/lib/less/cssmin.js
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+/**
+ * cssmin.js
+ * Author: Stoyan Stefanov - http://phpied.com/
+ * This is a JavaScript port of the CSS minification tool
+ * distributed with YUICompressor, itself a port
+ * of the cssmin utility by Isaac Schlueter - http://foohack.com/
+ * Permission is hereby granted to use the JavaScript version under the same
+ * conditions as the YUICompressor (original YUICompressor note below).
+ */
+
+/*
+* YUI Compressor
+* http://developer.yahoo.com/yui/compressor/
+* Author: Julien Lecomte - http://www.julienlecomte.net/
+* Copyright (c) 2011 Yahoo! Inc. All rights reserved.
+* The copyrights embodied in the content of this file are licensed
+* by Yahoo! Inc. under the BSD (revised) open source license.
+*/
+var YAHOO = YAHOO || {};
+YAHOO.compressor = YAHOO.compressor || {};
+
+/**
+ * Utility method to replace all data urls with tokens before we start
+ * compressing, to avoid performance issues running some of the subsequent
+ * regexes against large strings chunks.
+ *
+ * @private
+ * @method _extractDataUrls
+ * @param {String} css The input css
+ * @param {Array} The global array of tokens to preserve
+ * @returns String The processed css
+ */
+YAHOO.compressor._extractDataUrls = function (css, preservedTokens) {
+
+    // Leave data urls alone to increase parse performance.
+    var maxIndex = css.length - 1,
+        appendIndex = 0,
+        startIndex,
+        endIndex,
+        terminator,
+        foundTerminator,
+        sb = [],
+        m,
+        preserver,
+        token,
+        pattern = /url\(\s*(["']?)data\:/g;
+
+    // Since we need to account for non-base64 data urls, we need to handle 
+    // ' and ) being part of the data string. Hence switching to indexOf,
+    // to determine whether or not we have matching string terminators and
+    // handling sb appends directly, instead of using matcher.append* methods.
+
+    while ((m = pattern.exec(css)) !== null) {
+
+        startIndex = m.index + 4;  // "url(".length()
+        terminator = m[1];         // ', " or empty (not quoted)
+
+        if (terminator.length === 0) {
+            terminator = ")";
+        }
+
+        foundTerminator = false;
+
+        endIndex = pattern.lastIndex - 1;
+
+        while(foundTerminator === false && endIndex+1 <= maxIndex) {
+            endIndex = css.indexOf(terminator, endIndex + 1);
+    
+            // endIndex == 0 doesn't really apply here
+            if ((endIndex > 0) && (css.charAt(endIndex - 1) !== '\\')) {
+                foundTerminator = true;
+                if (")" != terminator) {
+                    endIndex = css.indexOf(")", endIndex); 
+                }
+            }
+        }
+
+        // Enough searching, start moving stuff over to the buffer
+        sb.push(css.substring(appendIndex, m.index));
+
+        if (foundTerminator) {
+            token = css.substring(startIndex, endIndex);
+            token = token.replace(/\s+/g, "");
+            preservedTokens.push(token);
+
+            preserver = "url(___YUICSSMIN_PRESERVED_TOKEN_" + (preservedTokens.length - 1) + "___)";
+            sb.push(preserver);
+
+            appendIndex = endIndex + 1;
+        } else {
+            // No end terminator found, re-add the whole match. Should we throw/warn here?
+            sb.push(css.substring(m.index, pattern.lastIndex));
+            appendIndex = pattern.lastIndex;
+        }
+    }
+
+    sb.push(css.substring(appendIndex));
+
+    return sb.join("");
+};
+
+/**
+ * Utility method to compress hex color values of the form #AABBCC to #ABC.
+ * 
+ * DOES NOT compress CSS ID selectors which match the above pattern (which would break things).
+ * e.g. #AddressForm { ... }
+ *
+ * DOES NOT compress IE filters, which have hex color values (which would break things). 
+ * e.g. filter: chroma(color="#FFFFFF");
+ *
+ * DOES NOT compress invalid hex values.
+ * e.g. background-color: #aabbccdd
+ *
+ * @private
+ * @method _compressHexColors
+ * @param {String} css The input css
+ * @returns String The processed css
+ */
+YAHOO.compressor._compressHexColors = function(css) {
+
+    // Look for hex colors inside { ... } (to avoid IDs) and which don't have a =, or a " in front of them (to avoid filters)
+    var pattern = /(\=\s*?["']?)?#([0-9a-f])([0-9a-f])([0-9a-f])([0-9a-f])([0-9a-f])([0-9a-f])(\}|[^0-9a-f{][^{]*?\})/gi,
+        m,
+        index = 0,
+        isFilter,
+        sb = [];
+
+    while ((m = pattern.exec(css)) !== null) {
+
+        sb.push(css.substring(index, m.index));
+
+        isFilter = m[1];
+
+        if (isFilter) {
+            // Restore, maintain case, otherwise filter will break
+            sb.push(m[1] + "#" + (m[2] + m[3] + m[4] + m[5] + m[6] + m[7]));
+        } else {
+            if (m[2].toLowerCase() == m[3].toLowerCase() &&
+                m[4].toLowerCase() == m[5].toLowerCase() &&
+                m[6].toLowerCase() == m[7].toLowerCase()) {
+
+                // Compress.
+                sb.push("#" + (m[3] + m[5] + m[7]).toLowerCase());
+            } else {
+                // Non compressible color, restore but lower case.
+                sb.push("#" + (m[2] + m[3] + m[4] + m[5] + m[6] + m[7]).toLowerCase());
+            }
+        }
+
+        index = pattern.lastIndex = pattern.lastIndex - m[8].length;
+    }
+
+    sb.push(css.substring(index));
+
+    return sb.join("");
+};
+
+YAHOO.compressor.cssmin = function (css, linebreakpos) {
+
+    var startIndex = 0,
+        endIndex = 0,
+        i = 0, max = 0,
+        preservedTokens = [],
+        comments = [],
+        token = '',
+        totallen = css.length,
+        placeholder = '';
+
+    css = this._extractDataUrls(css, preservedTokens);
+
+    // collect all comment blocks...
+    while ((startIndex = css.indexOf("/*", startIndex)) >= 0) {
+        endIndex = css.indexOf("*/", startIndex + 2);
+        if (endIndex < 0) {
+            endIndex = totallen;
+        }
+        token = css.slice(startIndex + 2, endIndex);
+        comments.push(token);
+        css = css.slice(0, startIndex + 2) + "___YUICSSMIN_PRESERVE_CANDIDATE_COMMENT_" + (comments.length - 1) + "___" + css.slice(endIndex);
+        startIndex += 2;
+    }
+
+    // preserve strings so their content doesn't get accidentally minified
+    css = css.replace(/("([^\\"]|\\.|\\)*")|('([^\\']|\\.|\\)*')/g, function (match) {
+        var i, max, quote = match.substring(0, 1);
+
+        match = match.slice(1, -1);
+
+        // maybe the string contains a comment-like substring?
+        // one, maybe more? put'em back then
+        if (match.indexOf("___YUICSSMIN_PRESERVE_CANDIDATE_COMMENT_") >= 0) {
+            for (i = 0, max = comments.length; i < max; i = i + 1) {
+                match = match.replace("___YUICSSMIN_PRESERVE_CANDIDATE_COMMENT_" + i + "___", comments[i]);
+            }
+        }
+
+        // minify alpha opacity in filter strings
+        match = match.replace(/progid:DXImageTransform\.Microsoft\.Alpha\(Opacity=/gi, "alpha(opacity=");
+
+        preservedTokens.push(match);
+        return quote + "___YUICSSMIN_PRESERVED_TOKEN_" + (preservedTokens.length - 1) + "___" + quote;
+    });
+
+    // strings are safe, now wrestle the comments
+    for (i = 0, max = comments.length; i < max; i = i + 1) {
+
+        token = comments[i];
+        placeholder = "___YUICSSMIN_PRESERVE_CANDIDATE_COMMENT_" + i + "___";
+
+        // ! in the first position of the comment means preserve
+        // so push to the preserved tokens keeping the !
+        if (token.charAt(0) === "!") {
+            preservedTokens.push(token);
+            css = css.replace(placeholder,  "___YUICSSMIN_PRESERVED_TOKEN_" + (preservedTokens.length - 1) + "___");
+            continue;
+        }
+
+        // \ in the last position looks like hack for Mac/IE5
+        // shorten that to /*\*/ and the next one to /**/
+        if (token.charAt(token.length - 1) === "\\") {
+            preservedTokens.push("\\");
+            css = css.replace(placeholder,  "___YUICSSMIN_PRESERVED_TOKEN_" + (preservedTokens.length - 1) + "___");
+            i = i + 1; // attn: advancing the loop
+            preservedTokens.push("");
+            css = css.replace("___YUICSSMIN_PRESERVE_CANDIDATE_COMMENT_" + i + "___",  "___YUICSSMIN_PRESERVED_TOKEN_" + (preservedTokens.length - 1) + "___");
+            continue;
+        }
+
+        // keep empty comments after child selectors (IE7 hack)
+        // e.g. html >/**/ body
+        if (token.length === 0) {
+            startIndex = css.indexOf(placeholder);
+            if (startIndex > 2) {
+                if (css.charAt(startIndex - 3) === '>') {
+                    preservedTokens.push("");
+                    css = css.replace(placeholder,  "___YUICSSMIN_PRESERVED_TOKEN_" + (preservedTokens.length - 1) + "___");
+                }
+            }
+        }
+
+        // in all other cases kill the comment
+        css = css.replace("/*" + placeholder + "*/", "");
+    }
+
+
+    // Normalize all whitespace strings to single spaces. Easier to work with that way.
+    css = css.replace(/\s+/g, " ");
+
+    // Remove the spaces before the things that should not have spaces before them.
+    // But, be careful not to turn "p :link {...}" into "p:link{...}"
+    // Swap out any pseudo-class colons with the token, and then swap back.
+    css = css.replace(/(^|\})(([^\{:])+:)+([^\{]*\{)/g, function (m) {
+        return m.replace(":", "___YUICSSMIN_PSEUDOCLASSCOLON___");
+    });
+    css = css.replace(/\s+([!{};:>+\(\)\],])/g, '$1');
+    css = css.replace(/___YUICSSMIN_PSEUDOCLASSCOLON___/g, ":");
+
+    // retain space for special IE6 cases
+    css = css.replace(/:first-(line|letter)(\{|,)/g, ":first-$1 $2");
+
+    // no space after the end of a preserved comment
+    css = css.replace(/\*\/ /g, '*/');
+
+
+    // If there is a @charset, then only allow one, and push to the top of the file.
+    css = css.replace(/^(.*)(@charset "[^"]*";)/gi, '$2$1');
+    css = css.replace(/^(\s*@charset [^;]+;\s*)+/gi, '$1');
+
+    // Put the space back in some cases, to support stuff like
+    // @media screen and (-webkit-min-device-pixel-ratio:0){
+    css = css.replace(/\band\(/gi, "and (");
+
+
+    // Remove the spaces after the things that should not have spaces after them.
+    css = css.replace(/([!{}:;>+\(\[,])\s+/g, '$1');
+
+    // remove unnecessary semicolons
+    css = css.replace(/;+\}/g, "}");
+
+    // Replace 0(px,em,%) with 0.
+    css = css.replace(/([\s:])(0)(px|em|%|in|cm|mm|pc|pt|ex)/gi, "$1$2");
+
+    // Replace 0 0 0 0; with 0.
+    css = css.replace(/:0 0 0 0(;|\})/g, ":0$1");
+    css = css.replace(/:0 0 0(;|\})/g, ":0$1");
+    css = css.replace(/:0 0(;|\})/g, ":0$1");
+
+    // Replace background-position:0; with background-position:0 0;
+    // same for transform-origin
+    css = css.replace(/(background-position|transform-origin|webkit-transform-origin|moz-transform-origin|o-transform-origin|ms-transform-origin):0(;|\})/gi, function(all, prop, tail) {
+        return prop.toLowerCase() + ":0 0" + tail;
+    });
+
+    // Replace 0.6 to .6, but only when preceded by : or a white-space
+    css = css.replace(/(:|\s)0+\.(\d+)/g, "$1.$2");
+
+    // Shorten colors from rgb(51,102,153) to #336699
+    // This makes it more likely that it'll get further compressed in the next step.
+    css = css.replace(/rgb\s*\(\s*([0-9,\s]+)\s*\)/gi, function () {
+        var i, rgbcolors = arguments[1].split(',');
+        for (i = 0; i < rgbcolors.length; i = i + 1) {
+            rgbcolors[i] = parseInt(rgbcolors[i], 10).toString(16);
+            if (rgbcolors[i].length === 1) {
+                rgbcolors[i] = '0' + rgbcolors[i];
+            }
+        }
+        return '#' + rgbcolors.join('');
+    });
+
+    // Shorten colors from #AABBCC to #ABC.
+    css = this._compressHexColors(css);
+
+    // border: none -> border:0
+    css = css.replace(/(border|border-top|border-right|border-bottom|border-right|outline|background):none(;|\})/gi, function(all, prop, tail) {
+        return prop.toLowerCase() + ":0" + tail;
+    });
+
+    // shorter opacity IE filter
+    css = css.replace(/progid:DXImageTransform\.Microsoft\.Alpha\(Opacity=/gi, "alpha(opacity=");
+
+    // Remove empty rules.
+    css = css.replace(/[^\};\{\/]+\{\}/g, "");
+
+    if (linebreakpos >= 0) {
+        // Some source control tools don't like it when files containing lines longer
+        // than, say 8000 characters, are checked in. The linebreak option is used in
+        // that case to split long lines after a specific column.
+        startIndex = 0;
+        i = 0;
+        while (i < css.length) {
+            i = i + 1;
+            if (css[i - 1] === '}' && i - startIndex > linebreakpos) {
+                css = css.slice(0, i) + '\n' + css.slice(i);
+                startIndex = i;
+            }
+        }
+    }
+
+    // Replace multiple semi-colons in a row by a single one
+    // See SF bug #1980989
+    css = css.replace(/;;+/g, ";");
+
+    // restore preserved comments and strings
+    for (i = 0, max = preservedTokens.length; i < max; i = i + 1) {
+        css = css.replace("___YUICSSMIN_PRESERVED_TOKEN_" + i + "___", preservedTokens[i]);
+    }
+
+    // Trim the final string (for any leading or trailing white spaces)
+    css = css.replace(/^\s+|\s+$/g, "");
+
+    return css;
+
+};
+
+exports.compressor = YAHOO.compressor;