title: xcassets: A XXxXX app icon is required for iPhone apps targeting releases of iOS prior to 7.0
body: <p>When trying to handle all icons and images using xcassets I get warnings stating that 57x57, 57x57@2x, 72x72 and 72x72@2x icons are needed as I target iOS 5+ devices.</p>
  
  <p>The problem is that:</p>
  
  <ul>
  <li>The default <code>AppIcon</code> group won't accept those icons.</li>
  <li>Adding separate entries for <code>Icon</code> and <code>Icon-72</code> won't fix the warnings neither.</li>
  </ul>