Revert "BROKEN!!!"

This reverts commit f6a1910daa24c58f206c9dd8d41b1f1cc90d47ac.
Merge branch 'layer-refactor' of https://github.com/fiicere/PK into layer-refactor

Conflicts:

PK/PK.xcodeproj/xcuserdata/fiicere.xcuserdatad/xcdebugger/Breakpoints.xc
bkptlist
	PK/PK/FocusedLayer.h
	PK/PK/FocusedLayer.m
	PK/PK/HelloWorldLayer.m
	PK/PK/PhysicsSprite.h
	PK/PK/PhysicsSprite.m