public UnSubscribeFromGCM AsUnSubscribeCommand()
 {
     var id = new GCMSubscriptionId(Token);
     return new UnSubscribeFromGCM(id, UserId, Token);
 }
 public SubscribeForGCM AsSubscribeCommand()
 {
     var id = new GCMSubscriptionId(Token);
     return new SubscribeForGCM(id, UserId, Token);
 }