Stage now has a 'scale' property which contains the amount the stage has been "scaled" by. Pointers when setting the coordinates now use the 'scale' of the stage to calculate the position more accurately.
Merge branch 'dev' into scalingInputs
Fixed issue where if the window was 'resized' the offset of the container wouldn't be 'recalculated' and thus the inputs would be off.

Also scale is only recalculated upon window resizing.
Merge branch 'dev' of https://github.com/gamelab/kiwi.js into dev