title: Listen for changes on data in Firebase (AngularFire)
body: <p>Is it possible to listen for Firebase server updates on the DOM in AngularFire?</p>
  
  <p>I want to be able to fetch any updates when they are returned from the server to update the values of an array. Basically my problem is that I am using <code>Firebase.ServerValues.TIMESTAMP</code> which is set by the server.</p>
  
  <p>Furthermore, why can't I use <code>new Date()</code> to create a client timestamp?</p>