title: Save and Get $priority of item in Firebase collection AngularFire 0.6.0
body: <p>Let's say I have a collection of items</p>
  
  <pre><code>var itemsRef = new Firebase("https://example.firebaseio.com/items");  
  $scope.items = $firebase(itemsRef);
  </code></pre>
  
  <p>And I want to save a new item to the collection with a <code>$priority</code></p>
  
  <pre><code>$scope.items["thing"] = {name:'The Thing'};
  $scope.items["thing"].$priority = 1;
  $scope.items.$save("thing");
  </code></pre>
  
  <p>So far so good - I can see the new item in my collection. </p>
  
  <p>Now let's fetch it and figure out what <code>$priority</code> I just assigned to it:</p>
  
  <pre><code>var thingRef = new Firebase("https://example.firebaseio.com/items/thing");  
  $scope.thing = $firebase(thingRef);
  $scope.thing.$on("loaded", function() {
    console.log($scope.thing);
  });
  </code></pre>
  
  <p>Which shows us our Firebase object in the console <strong>without</strong> a <code>$priority</code> assigned to it. </p>
  
  <p>However if we do this:</p>
  
  <pre><code>//After saving the "thing" $priority
  $scope.items.$on("loaded", function() {
    console.log($scope.items);
  });
  </code></pre>
  
  <p>You will see the child node and its <code>$priority</code></p>
  
  <p><strong>What is the correct way to both save and get priorities for a Firebase collection item?</strong></p>