title: Ionic: close/hide modal on Android back button not working
body: <p>According to the documentation (<a href="http://ionicframework.com/docs/api/controller/ionicModal/" rel="nofollow">http://ionicframework.com/docs/api/controller/ionicModal/</a>), the default behaviour is to close the current modal on back button. But it's not closing anything, instead, it performs the action of the main view, go back.</p>
  
  <blockquote>
    <p>{boolean=} hardwareBackButtonClose: Whether the modal can be closed using the hardware back button on Android and similar devices. Default: true.</p>
  </blockquote>
  
  <p>Here is my code when I initialize the modal:</p>
  
  <pre><code>$ionicModal.fromTemplateUrl('app/components/contacts/views/contacts.selectModal.html', {
      scope: $scope,
      animation: 'slide-in-up',
      hardwareBackButtonClose: true
  }).then(function(modal) {
      $scope.contactSelect = modal;
  });
  </code></pre>
  
  <p>I'm using Android 5.1, Ionic 1.2.1</p>