title: iOS 8 Push Notification Action not working in background activation mode
body: <p>I am experiencing a problem with the following lines of code : </p>
  
  <pre><code>    UIMutableUserNotificationAction *cancelAction = [[UIMutableUserNotificationAction alloc] init];
      cancelAction.identifier = kCancelIdentifier;
      cancelAction.title = @"Cancel";
      cancelAction.activationMode = UIUserNotificationActivationModeBackground;
      cancelAction.destructive = YES;
      cancelAction.authenticationRequired = YES;
  </code></pre>
  
  <p>When responding to this action of the push notification, it will always open up the application rather than performing task in the background.</p>