title: Need to reverse a repeat region
body: <p>I have a firebase element that is pulling in the last 5 items</p>
  
  <pre><code>&lt;firebase-element id="base" location="https://mydb.firebaseio.com/mydata" data="{{items}}" keys="{{keys}}" limit="5" &gt;&lt;/firebase-element&gt;
  </code></pre>
  
  <p>That is bound to this repeat region</p>
  
  <pre><code>&lt;template repeat="{{id in keys}}"&gt;
  
  &lt;x-chat-list id="chatList"  username="{{items[id]['uuid']}}" text="{{items[id]['text']}}" &gt;&lt;/x-chat-list&gt;
  
  &lt;/template&gt;
  </code></pre>
  
  <p>I simply need to reverse the order of the repeat region.</p>