title: iPad didn't call didRegisterForRemoteNotificationsWithDeviceToken
body: <p>I'm trying to get device token in iPad for remote push notifications;
  registerForRemoteNotificationTypes is called okay, no error, but didRegisterForRemoteNotificationsWithDeviceToken also not been called;
  Application is appear in Settings/Notification;
  What's I doing wrong?</p>
  
  <p>iPhone is registering successfully.</p>
  
  <p>Thank you</p>
  
  <p>PS: iPad 1, iOs 5.1</p>