title: Get queue of iPodMusicPlayer
body: <p>I'm using iPodMusicPlayer for my MPMusicController.
  And I want to get music queue as MPMediaItemCollection.
  How can I do that?</p>
  
  <p>In my app, you can select and play music in your music library by MPMediaPickerController. 
  Then, if you were playing music by iPod music app, it is interrupted.
  After music you selected in my app finished, I want to back to music on iPod music app.</p>
  
  <p>Thank you.</p>