title: (key,value) in object loop with nested ng-repeat
body: <p>I have a ng-repeat iteration like this:</p>
  
  <pre><code>&lt;p ng-repeat="(label,field) in app.config.properties"&gt;
                  &lt;span class="radio-group" &gt; 
                          &lt;div ng-repeat="option in x.options"&gt;
                                {{label}}
                          &lt;/div&gt;
                      &lt;/span&gt;
  
  &lt;/p&gt;
  </code></pre>
  
  <p>I am unable to access the label inside nested loop. I also tried using $parent.label but doesn't seem to work.</p>