title: SKNode scale from the touched point
body: <p>I have added UIPinchGestureRecognizer to my scene.view to scale my content. I actually scale the parent node where all my visible contents reside. But I have  problem though with scaling point. The thing is node scale from the lower-left corner. It's definitely not what I want. Do I have to write lots of code to be able to scale from the point where pinching occurs? Could you please give some hints as to what way to follow.</p>