Removing old tilesheet code
Optimized HXP.clear
Backdrop and Emitter now use Tilesheets
Tilemap is now optimized for Tilesheets
Optimizing Tilemap rendering (only draws what is on screen)
Tilemap.shiftTiles is working again
Screen is scaled to window width/height
Sprites now use Tilesheets (flipping doesn't work)
Merge branch 'master' of github.com:MattTuttle/HaxePunk into spritebatch

Conflicts:
	src/com/haxepunk/HXP.hx
	src/com/haxepunk/tweens/misc/MultiVarTween.hx
Merge branch 'master' into spritebatch

Conflicts:
	src/com/haxepunk/HXP.hx
Merge branch 'master' into spritebatch

Conflicts:
	src/com/haxepunk/HXP.hx
	src/com/haxepunk/graphics/Spritemap.hx
Fixed: Graphics updated when their parent Entity was not active.
Fixed: Origins were changed to Floats in the current version of Flashpunk.
Merge branch 'spritebatch' of github.com:MattTuttle/HaxePunk into spritebatch

Conflicts:
	examples/build.nmml
Revert "Fixed: Graphics updated when their parent Entity was not active."

This reverts commit adc57a89d1cd6c5bf086280a6ffa405a51ea42cc.
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/spritebatch'
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/textureatlas'
Added: A function that finds the difference between two angles.