Cocoapods

Hello everyone. I put together a podspec for Cocos2d-iPhone 3.0. So far I've been able to run the sample project by starting with a template, removing the libs from the project, removing the objective chimpunk target and a making a podfile resembling this: https://gist.github.com/dylan/9797584 and running `pod install` .

Hopefully this can act as a starting point for making cocos2d/chipmunk Cocoapods compatible.

Please try it out! :smile: