issue#3451.add one article acout cordinate system
Merge remote-tracking branch 'upstream/master'
issue#3451.add one article about action
issue#3451.add one article about animations
issue#3451.add one article about Skeletal_animation
issue#3451.add one article about Transitions
issue#3451.add one article about tiled map
issue#3451.add one article about particles
issue#3451.add one article about Scheduler and Timer
issue#3451.add one article about Reference Count and AutoReleasePool in Cocos2d-x
issue#3451.add one article about texture cache
issue#3451.add one article about Max size of textures in cocos2d-x depends on each platform
issue#3451.add one article about sound
issue#3451.add one article about CCArray
issue#3451.add one article about CCDictionary
issue#3451.add one article about CCString
issue#3451.modify catalog
Merge pull request #29 from renshan/master

dd one article acout cordinate system