viewDidAppear in BNRDocumentPageViewController for better page curling (not perfect)

gistfile1.m

- (void)viewDidAppear:(BOOL)animated
{
    UIView *targetView = self.view.superview.superview; // UINavigationTransitionView
    targetView.clipsToBounds = NO;
    [targetView.superview bringSubviewToFront:targetView];

    targetView = targetView.superview; // UILayoutContainerView
    targetView.clipsToBounds = NO;
    [targetView.superview bringSubviewToFront:targetView];

    [super viewDidAppear:animated];
    NSLog(@"%@",self.view);
    NSLog(@"\n%@",[[[UIApplication sharedApplication] keyWindow] performSelector:@selector(recursiveDescription)]);
}