closed #5537: add setAutoStep, isAutoStep and step method for PhysicsWorld.
closed #5537: add test case
Fix video scale issue in iOS
Optimize FPS control algorithm under Android.
Refactor #5580: Add new file&directory apis into FileUtils
Refactor #5580: Fix Win32 compile issue
Refactor #5580: Fix some issues
Refactor #5580: Add test case for FileUtils' file and directory manipulations
Merge branch 'v3' of git://github.com/cocos2d/cocos2d-x into FileUtils_FILE_API
Cascade slide ball's opacity and the Slider's
Also cascade the colours
Refactor #5580: Make isDirectoryExist support relative path
Refactor #5580: Refactor Hungary style code in test case
no use JoinThread
Merge branch 'v3' of https://github.com/cocos2d/cocos2d-x into v3
Merge branch 'v3' of https://github.com/cocos2d/cocos2d-x into v3
fixed crash cause by incorrect font name.
change pure virtual function to virtual function in action series
remove unimplemented function to deprecated and give an empty implementation
add CC_DLL to Vec2
Merge branch 'v3' into v3_dll
Merge branch 'v3' of https://github.com/cocos2d/cocos2d-x into v3