title: Ionic click event fires twice
body: <p>Lets assume I have an anchor tag. The click event fetches some data from my backend, and the data updates my model. </p>
  
  <pre><code>&lt;a ng-if="model.isAuthenticated" ng-click="model.download()" class=button button-small icon ion-android-download&gt;&lt;/a&gt;
  </code></pre>
  
  <p>Can someone please explain to me why, if I place this anchor inside ion-nav-buttons tags, the click event fires twice ???</p>
  
  <pre><code> &lt;ion-nav-buttons side="right"&gt;&lt;a ng-if="model.isAuthenticated" ng-click="model.download()" class=button button-small icon ion-android-download&gt;&lt;/a&gt;&lt;/ion-nav-buttons&gt; 
  </code></pre>