Upgrade vulcanize to 0.7.6.

node_modules/vulcanize/lib/vulcan.js

 /**
  * @license
  * Copyright (c) 2014 The Polymer Project Authors. All rights reserved.
  * This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
  * The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
  * The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
  * Code distributed by Google as part of the polymer project is also
  * subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
  */
 
 // jshint node: true
 
-var cssom = require('cssom');
 var fs = require('fs');
 var path = require('path');
 var uglify = require('uglify-js');
 var url = require('url');
 var whacko = require('whacko');
 
 var constants = require('./constants.js');
 var optparser = require('./optparser.js');
 var pathresolver = require('./pathresolver');
 var utils = require('./utils');
@@ skipping 169 matching lines @@
     js_err.detail = e.message + ' at line: ' + e.line + ' col: ' + e.col;
     js_err.content = content;
     js_err.toString = function() {
       return this.message + '\n' + this.detail + '\n' + this.content;
     };
     throw js_err;
   }
 }
 
 function compressCSS(content) {
-  var out;
-  try {
-    var ast = cssom.parse(content);
-    out = ast.toString();
-  } catch (e) {
-    if (options.verbose) {
-      console.log('Error parsing CSS:', e.toString());
-      console.log('Falling back to removing newlines only');
-    }
-    out = content;
-  } finally {
-    return out.replace(/[\r\n]/g, '');
-  }
+  // remove newlines
+  var out = content.replace(/[\r\n]/g, '');
+  // remove css comments (/* ... */)
+  out = out.replace(/\/\*(.+?)\*\//g, '');
+  // remove duplicate whitespace
+  out = out.replace(/\s{2,}/g, ' ');
+  return out;
 }
 
 function removeCommentsAndWhitespace($) {
   function walk(node) {
     var content, c;
     if (!node) {
       return;
     } else if (isCommentOrEmptyTextNode(node)) {
       $(node).remove();
       return true;
@@ skipping 121 matching lines @@
       if(options.verbose) {
         console.log('Import Dependency deduplicated');
       }
       el.remove();
     }
   });
 }
 
 exports.processDocument = handleMainDocument;
 exports.setOptions = setOptions;