title: Show a loading screen as background images load in ng-repeat
body: <p>I have a list loaded through <code>ng-repeat</code> where each element contains an <code>img</code> tag. I'd like to show some sort of loading indicator (occluding the list items) until every image within every item has finished loading. </p>
  
  <p>I guess I would need to hook into some event broadcast by the angular <code>back-img</code> directive but I don't really know where to start here.</p>