message: Updated title/hidden when props change
  The hidden doesn't really work because the navigation bar stays the same size but think that's a current bug (and not a standard usecase)
diff: @@ -29,10 +29,16 @@ using namespace facebook::react;
  {
  const auto &oldViewProps = *std::static_pointer_cast<NVNavigationBarProps const>(_props);
  const auto &newViewProps = *std::static_pointer_cast<NVNavigationBarProps const>(props);
  - if (oldViewProps.hidden != newViewProps.hidden)
  + if (oldViewProps.hidden != newViewProps.hidden) {
  _isHidden = _hidden = newViewProps.hidden;
  - if (oldViewProps.title != newViewProps.title)
  + if (self.reactViewController == self.reactViewController.navigationController.topViewController) {
  + [self.reactViewController.navigationController setNavigationBarHidden:self.hidden];
  + }
  + }
  + if (oldViewProps.title != newViewProps.title) {
  _title = [[NSString alloc] initWithUTF8String: newViewProps.title.c_str()];
  + [self.reactViewController.navigationItem setTitle:self.title];
  + }
  [super updateProps:props oldProps:oldProps];
  }
  