Cocos2d-iphone v.3.1 support

Here are some patches to make spine-cocos2d-iphone work with cocos2d-iphone v. 3.1

PolygonBatch has been removed since Cocos2d-iphone has automatic
batching. CCDrawingPrimitives calls have been changed to CCDrawNode
calls and the rendering of triangles have been ported to CCRenderer.

Xcode projects have been updated with the necessary GLKit dependancy.

The spineboy and goblins examples both seem to be working fine.