title: ng-repeat force a rerender
body: <p>I know how ngRepeat uses hash keys to not rerender elements,
  I am storing a simple array of strings, and I would like to force the re render of the dom , is there a simple way to do it?</p>
  
  <p>to force ng-repeat to re render itself even though my string array havn't changed?</p>
  
  <p>Why :</p>
  
  <pre><code>$scope.image = "image/jpg..."
  $scope.confs = ['glow','sepia','brighten']
  
  &lt;div ng-repeat="conf in confs"&gt;
     &lt;div my-directive="conf"&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>I want to rerun the ng-repeat when the image changes, not when the conf change</p>