title: iOS Register for notifications in background
body: <p>I need to refresh push token if user don't run app for long time. I tried to use background mode and     application:performFetchWithCompletionHandler:
  method. Inside this method I call - registerUserNotificationSettings:(UIUserNotificationSettings <em>)notificationSettings. And then I expect that didRegisterUserNotificationSettings (UIUserNotificationSettings</em>)notificationSettings will be called but this not happen. Is there any way to register in APNS without running app?</p>