bind VAO 0 to clear the current vao context

reference to post on cocos2d forums: http://forum.cocos2d-iphone.org/t/spine-runtime-for-3-0-problems/13504
Merge pull request #224 from kalo/cc2dv3.0

bind VAO 0 to clear the current vao context
Use short indices.
Removed short names. Better project setup.
Docs.
Fixed spine-cocos2d for v3.0. Removed short names.
Always apply content scale.
Show using a lambda for callbacks.
Removed WIP.
Unbind VAO.
Removed unnecessary cast, property access.
Clean up.

Setting Attachment clears vertices count.
Fixed double free.
Fixed leak.
Fixed zero bone scale.
Minor changes.
Meshes, FFd and skinning for spine-as3.
Brings spine-starling up to date with spine-as3.

No mesh rendering yet.
Better example, no PMA.
Use getDisplayedOpacity.