Merge pull request #389 from nickskull/develop-v3

Fixed 64bit build with kazmath
CCLabelAtlas Documentation
CCParticleSystem Documentation
CCParticleSystemQuad Documentation
CCLabelBMFont Extra Documentation
Little bit of house keeping
Optimization to CCNode & basic positioning
Optimizes CCLayout, fixes #370
Updating to the latest Chipmunk version.
Implementing CCPhysicsBody.affectedByGravity and adding more unit tests. Fixed a bug with CCPhysicsShape.group.
Updating the Chipmunk project reference.
Merge branch 'develop-v3' of github:cocos2d/cocos2d-iphone into develop-v3
CCParticleBatchNode Documentation
Various Private Header Documentation Tidy
CCClippingNode documentation
CCMotionStreak documentation
Some smaller documentation tweaks
CCProgressNode documentation
Merge branch 'develop-v3' of https://github.com/cocos2d/cocos2d-iphone into develop-v3
Merge pull request #392 from cocojoe/develop-v3

Documentation
Merge branch 'develop-v3' of https://github.com/cocos2d/cocos2d-iphone into develop-v3
#369 Fixed issues loading TMX and adding quads
Refactored TileMap code referencing old quad methods
Fixed TileMap header/source definitions
Benchmarked #368 after fixes, removed warning, non issue now
Merge pull request #397 from cocojoe/develop-v3

TileMap Fixes
install script was using a hard-coded Chipmunk revision