Unified mac project

includes 2 xcodeprojects:

  * one for all the libraries
  * one for all the samples

It is easier to maintain, and easier for user to include in their projects.
The samples project includes the "libraries".
No need to use a workspace. 

Also, includes CocosDragon, MoonWarriors, CrystalCraze and Watermelon With Me (because it is super easy to add new projects now)