title: ngAnimate with dynamic class 1.2rc1
body: <p>The new ngAnimate works with a hard coded class:</p>
  
  <pre><code>&lt;div ng-view class="forward"&gt;&lt;/div&gt;
  
  .forward.ng-enter {
    -webkit-animation: from_right 10s ease;
  }
  </code></pre>
  
  <p>but not a dynamic class:</p>
  
  <pre><code>&lt;div ng-view ng-class="{'forward': true}"&gt;&lt;/div&gt;
  </code></pre>
  
  <p>How can I dynamically switch between animations for enter and exit (e.g. forward and back in a phone wizard)?</p>