Feature/add cocos2d version 3.0 and 3.1

Adds the specs to include Cocos2D-iphone version 3.*

**version 3.0**
Currently there are only release candidate versions available, and this specs covers the rc4 and rc5 ones. Previous versions have the project file bad formed and does not compile correctly


**version 3.1** alpha
This is an alpha version released recently.