Fixed iOS 6 Implementation Bugs

- Fixed a bug that prevented the game restart from triggering properly
on iOS 6
Fixed iOS6 Drawing Bug

- Fixed a bug that caused some images on iOS6 to be rendered
incompletely or not at all
iOS6 Canvas DPI Bug Fixes

- Fixed bugs related to retina display DPI issues that caused
pixelation in images being drawn to canvas objects on retina display
screens
Merge branch 'josh's-branch'