title: Register Firebase Listener Without Calling It?
body: <p>Is it possible to register a Firebase listener function without calling it when you register it?</p>
  
  <p>For example:</p>
  
  <pre><code>this.gamestateURL.on('value', function(snapshot){
      self.GameStateChangeEvent(snapshot);
  });
  </code></pre>
  
  <p>GameStateChangeEvent function fires immediately upon setting up the listener.</p>
  
  <p>Thank you.</p>