title: video.js plugins not working
body: <p>I'm trying to get any plugins from video.js to work, but I keep getting the errors as it pertains to <code>videojs('video_example_1)</code>, saying <code>videojs</code> is not defined. I copied the code from a recent plugin just to see if I'm doing something wrong. The exact error I'm getting is:</p>
  
  <pre><code>TypeError: vjs is undefined
  var video = videojs('video_example_1'); (line 41)
  ReferenceError: videojs is not defined
  </code></pre>
  
  <p>Can someone help? Some code pasted below:</p>
  
  <pre><code>&lt;link href="//vjs.zencdn.net/4.4/video-js.css" rel="stylesheet"&gt;
  &lt;link href="http://theonion.github.io/videojs-endcard/stylesheets/videojs.endcard.css"       
  rel="stylesheet"&gt;
  &lt;script src="//vjs.zencdn.net/4.4/video.js"&gt;&lt;/script&gt;
  &lt;script src="http://theonion.github.io/videojs-endcard/javascripts/videojs.endcard.js"&gt;    
  &lt;/script&gt;
  
  &lt;video
  id="example_video_1" class="video-js vjs-default-skin" controls preload="auto"    
  width="640" height="264"
  data-setup='{"example_option":true}'&gt;
  
  &lt;source src="http://video-js.zencoder.com/oceans-clip.mp4" type='video/mp4' /&gt;  
  &lt;source src="http://video-js.zencoder.com/oceans-clip.webm" type='video/webm' /&gt;
  &lt;source src="http://video-js.zencoder.com/oceans-clip.ogv" type='video/ogg' /&gt;  
  
  &lt;/video&gt;
  &lt;script&gt;
  // Sync or Async, you decide.
  function getRelatedContent(callback) {
  var div = document.createElement('div');
  var p = document.createElement('p');
  p.innerHTML = "So Cool You'll HAVE to Click This!";
  div.appendChild(p);
  setTimeout(function(){
      // Needs an array
      callback([div]);
  }, 0);
  }
  
  function getNextVid(callback) {
  var div = document.createElement('div');
  var anchor = document.createElement('a');
  anchor.innerHTML = "Users will be taken to the VideoJS website after 10 seconds!"
  anchor.href = "http://www.videojs.com/"
  div.appendChild(anchor)
  setTimeout(function(){
      callback(div);
  }, 0);
  }
  
  var video = videojs('video_example_1');
  video.endcard({
  getRelatedContent: getRelatedContent,
  //  getNextVid: getNextVid    //uncomment this for auto-playing video
  })
  &lt;/script&gt;
  </code></pre>