title: orderBy descending order doesn't work in my case?
body: <p>I expect to see decesecing order base on <code>points</code> work but it doesn't, here is the demo <a href="http://jsfiddle.net/uRPSL/34/" rel="nofollow">http://jsfiddle.net/uRPSL/34/</a></p>
  
  <p>ng-repeat</p>
  
  <pre><code>&lt;ul ng-repeat="friend in user"&gt;
      &lt;li ng-repeat="relation in friend.relationship | orderBy:'points':true"&gt;    
        {{relation.name}}
      &lt;/li&gt;
  &lt;/ul&gt;
  </code></pre>
  
  <p>js</p>
  
  <pre><code>app.controller('Controller', function ($scope, $rootScope, $location) {
      $scope.user = [{
          'uId': 1,
              'name': 'Joe',
              'relationship': [{
              'uId': 2,
                  'name': 'Jeremy',
                  'tabs': [{
                  'tabId': 1
              }],
                  'tasks': [{
                  'name': 'Im Jeremy Lin'
              }],
              'points': 50
  
          }]
      }, {
          'uId': 2,
              'name': 'justin',
              'relationship': [{
              'uId': 3,
                  'name': 'Jordan',
                  'tabs': [{
                  'tabId': 2
              }],
                  'tasks': [{
                  'name': 'Im Jasmin Jacob'
              }],
              'points': 100
  
          }]
      }];
  })
  </code></pre>