Merge pull request #101 from jtwigg/develop

Develop
Updates the about box
Prevents the Usage manager from popping up the browser on first launch
Adds support for sandboxing in SpriteBuilder
New ccb-file icon
Updates Cocos2d
Reassign nudge to be Cmd- left and right.
Alter some first responder coordination.
Issue#102 newFolder/file  menu & popup now place items in appropriate locations.
Merge branch 'develop' of https://github.com/apportable/SpriteBuilder into develop