title: Keyboard navigation within token input scrollable dropdown
body: <p>So I have a token-input scrollable dropdown. </p>
  
  <p>From what I've seen, it's not possible out of the box to limit its height and make it scrollable (when I have many items within the list) so I added the following:</p>
  
  <pre class="lang-css prettyprint-override"><code>div.token-input-dropdown {
      overflow: auto;
      max-height: 150px;
  }
  </code></pre>
  
  <p>My problem is that I'm unable to properly navigate with the keyboard within that list. I mean, I can press the down key and the next item will be highlighted, but when it reaches the bottom, the content won't keep scrolling. Does anyone know how to fix this?</p>
  
  <p>Here is a fiddle: <a href="http://jsfiddle.net/lav911/MfRrY/" rel="nofollow">http://jsfiddle.net/lav911/MfRrY/</a></p>