secondView positioning fix & auto fullscreen support

Hanges:
* secondView positioning should work OK now, for both scale & resize
transformers
* changed scaleFactor behaving in ScaleTransformer to match
ResizeTransformer
* auto FullScreen for KitKat+
* dragging disabled when pointerCount > 1 (I use "pinch2zoom" on
dragView)
* changes in onLayout() method (fix bug with positioning secondView... &
with Android Studio preview)