title: AngularJS Trigger ng-animate when binding value change
body: <p>I have a directive where some content is bound via <code>ng-html-bind-unsafe</code>. I like to have a transition when the content changes. I can use jquery to fade it out, change the content value and fade it back in.</p>
  
  <p>Is there a more elegant way with AngularJS ?</p>