Merge pull request #133 from jtwigg/develop

Develop
Fixes export of bitmap fonts
Updates Cocos2D
Merge branch 'develop' of github.com:apportable/SpriteBuilder into develop
Inititial version of AV Document preview.
WIP Issue#130 : First draft of Audio Preview resource manager.
Merge branch 'develop' of https://github.com/apportable/SpriteBuilder into develop
Issue#130 adjust Audio preview based on feedback.