title: web_accessible_resources doesnt works
body: <p>manifest.json:</p>
  
  <pre><code>  "content_scripts": [
      {
        "matches": [ "*://google.com"],
        "js": ["js/google.js"]
      },
      {
        "matches": [ "*://facebook.com/*"],
        "js": ["js/facebook.js"]
      }
    ],
  "web_accessible_resources": ["js/jquery-2.0.3.min.js"]
  </code></pre>
  
  <p>So, first and second sites needs jquery and some little scripts (google.js and facebook.js). I use <code>web_accessible_resources</code> because in Chrome 29 I have error: <code>GET chrome-extension://invalid/</code>. </p>
  
  <p>Now I having new erros - in google.js and facebook.js - <code>Uncaught ReferenceError: $ is not defined</code>.</p>
  
  <p>I try</p>
  
  <pre><code>var s = document.createElement('script');
  s.src = chrome.extension.getURL("js/jquery-2.0.3.min.js");
  </code></pre>
  
  <p>But the same error - jquery doesnt work on google.com and facebook.com (matches). How to fix it? Thanks.</p>