title: imagePickerController broken in Xcode 6.3
body: <p>After upgrading to latest Xcode 6.3, the imagePickerController no longer works. Any idea what's the latest changes to this method?</p>
  
  <pre><code>func imagePickerController(picker: UIImagePickerController!, didFinishPickingMediaWithInfo info: NSDictionary!) {...} 
  
  Error message:
  'imagePickerController:didFinishPickingMediaWithInfo:' provided by method 'imagePickerController(_:didFinishPickingMediaWithInfo:)' conflicts with optional requirement method 'imagePickerController(_:didFinishPickingMediaWithInfo:)' in protocol 'UIImagePickerControllerDelegate'
  </code></pre>