title: swipe-down event not firing - ionic framework
body: <p>I am creating a simple app with the ionic framework, and I want to run a function on each of the swipe events. Swipe Up, down, left, and right.</p>
  
  <pre><code>    &lt;ion-content on-swipe-up="add()" on-swipe-left="multiply()" on-swipe-right="divide()" on-swipe-down="subtract()" scroll="false"&gt;
      &lt;div id="game"&gt;
          &lt;h1&gt;{{subject.value}}&lt;/h1&gt; 
      &lt;/div&gt;
  &lt;/ion-content&gt;
  </code></pre>
  
  <p>All of the events work fine, except on-swipe-down. No matter what I do, I cannot get that event to fire. I have tried everything I can think of: setting the scroll property, attaching the events to different elements, emulating instead of in the browser, and have made a new bare-bones project where I'm just testing the on-swipe-down event. Nothing has worked.</p>
  
  <p><a href="http://codepen.io/anon/pen/enwtb" rel="nofollow"><strong>CorePen</strong></a></p>