Tmp fix for positioning seckondView & dragView

- Added ViewTreeObserver (issue it's triggered once when scale
transformer is used, but when we use resizeTransformer it duplicate
seckondView positioning from DraggableViewCallback)
- Changed dragView size calculation, to match size returned by
getMinWidth() of transformer (issue witch calculations in
resizeTransformer)
WARNING - now scaleFactor works different:
Previously  originalSize / scaleFactor was left position of drag view on
minimized state
Now originalSize / scaleFactor is dragView size on minimized state

- reset method (tmp name) I use it to maximize dragView on screen
rotation, and recover original height on portrait mode

- some minor changes