Use UIPanGestureRecognizer instead of basic UITouch handling

Hi,

I switched out the basic UITouch handling logic and replaced it with a UIPanGestureRecognizer approach. Interactive sliding now works fine on the whole "slidingView" view, no matter if it's a UINavigationController or has a UIScrollView as a subview.
Also a small spelling fix "Slideing" -> "Sliding" ;)

Greetings,
Alex