[cocos2d] Fix the API issues spotted by the tests
[cocos2d] fix the constructors signatures
[cocos2d] replace setter-only properties by methods
[cocos2d] fix more tests
[cocos2d] add test for Mac bindings
[cocos2d] fix issues in osx tests
[cocos2d] more tests (some failing) for osx
[cocos2d] Make sure every single test pass
Merge pull request #124 from StephaneDelcroix/cocos2d

[cocos2d] Fix the API issues spotted by the tests