message: Set ios twitter sample tab titles
diff: UIViewController *homeViewController = [[NVSceneController alloc] init: 0 tab: 0 title: @"Home" appKey: @"twitter"];
  UINavigationController *homeController = [[UINavigationController alloc] initWithRootViewController:homeViewController];
  - homeController.tabBarItem = [[UITabBarItem alloc] initWithTabBarSystemItem:UITabBarSystemItemSearch tag:0];
  + homeController.tabBarItem = [[UITabBarItem alloc] initWithTitle:@"Home" image:nil tag:1];
  UIViewController *notificationsViewController = [[NVSceneController alloc] init: 0 tab: 1 title: @"Notifications" appKey: @"twitter"];
  UINavigationController *notificationsController = [[UINavigationController alloc] initWithRootViewController:notificationsViewController];
  - notificationsController.tabBarItem = [[UITabBarItem alloc] initWithTabBarSystemItem:UITabBarSystemItemTopRated tag:1];
  + notificationsController.tabBarItem = [[UITabBarItem alloc] initWithTitle:@"Notifications" image:nil tag:1];
  UITabBarController *tabBarController = [[UITabBarController alloc] init];
  [tabBarController setViewControllers:@[homeController, notificationsController]];
  