Refactored: Layer Sprites moved to Scene from AtlasData.
Refactored: Scene now tells AtlasData when to render instead of Engine.
Added: Graphics now maintain references to their parent entities.
Fixed: Circle/Rect/Text now use get their layer sprite from the scene instead of AtlasData.
Fixed: Entity.addGraphic didn't update the GraphicList entity.
Fixed: Null Refernce when setEntity was passed null.
Fixed: Text is no longer selectable.
Removed: Moot null check of parent sprite in Text.findParentSprite().
Fixed:  HXP.windowWidth/Height now set to correct values.
Fixed: Screen resizing would occur before scaleY was set.
Fixed: incorrect return statement in GraphicList.add()..
Fixed: Text reported wrong width/height when the screen had been scaled.
Fixed: HXP.windowWidth/Height now show correct values after a resize event.
Merge pull request #110 from MaskedPixel/mobile-dev-fix

Fixing several issues with text and scaling on mobile targets.