Upgrade vulcanize to 0.7.6.

node_modules/vulcanize/lib/constants.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
  */
 
 var JS = 'script:not([type]), script[type="text/javascript"]';
 var URL_ATTR = ['href', 'src', 'action', 'style'];
 
 module.exports = {
   EOL: require('os').EOL,
   ELEMENTS: 'polymer-element:not([assetpath])',
   ELEMENTS_NOSCRIPT: 'polymer-element[noscript]',
-  ABS_URL: /(^data:)|(^http[s]?:)|(^\/)|(^mailto:)|(^tel:)|(^sms:)/,
+  ABS_URL: /(^data:)|(^http[s]?:)|(^\/)|(^mailto:)|(^tel:)|(^sms:)|(^#)/,
   REMOTE_ABS_URL: /(^http[s]?\:)|(^\/\/)/,
   IMPORTS: 'link[rel="import"][href]',
   URL: /url\([^)]*\)/g,
   URL_ATTR: URL_ATTR,
   URL_ATTR_SEL: '[' + URL_ATTR.join('],[') + ']',
   URL_TEMPLATE: '{{.*}}',
   JS: JS,
   JS_SRC: JS.split(',').map(function(s){ return s + '[src]'; }).join(','),
   JS_INLINE: JS.split(',').map(function(s) { return s + ':not([src])'; }).join(','),
   CSS: 'style:not([type]), style[type="text/css"]',
   // Output match is [ 'Polymer(', NAME_OF_ELEMENT OR undefined, ',', { or ) ]
   POLYMER_INVOCATION: /Polymer\(([^,{]+)?(,\s*)?({|\))/
 };