Merge pull request #43 from vlee90/newBranch

Fixed issue with taco spawn location and heroFallAnimation position.
add app icon
Merge pull request #46 from TinasFu/appIcon

add app icon
added game center onto game over screen
Merge pull request #47 from vlee90/newBranch

Adjusted chain height multiplier on hero.height to change crane position...
Added speed increase dependent on score.