message: Tweaked format
  visibleViewController is the coalesce of presented and top
diff: - (UIViewController *)navigation_childViewControllerForStatusBarStyle
  {
  - return [self activeScene];
  + return ((NVNavigationStackView *) [self.view viewWithTag:NAVIGATION_STACK]).navigationController.visibleViewController;
  }
  - (UIViewController *)navigation_childViewControllerForStatusBarHidden
  {
  - return [self activeScene];
  -}
  -
  --(UIViewController *)activeScene
  -{
  - UINavigationController *navigationController = ((NVNavigationStackView *) [self.view viewWithTag:NAVIGATION_STACK]).navigationController;
  - return [navigationController presentedViewController] ?: [navigationController topViewController];
  + return ((NVNavigationStackView *) [self.view viewWithTag:NAVIGATION_STACK]).navigationController.visibleViewController;
  }
  + (void)load
  