add method for PositionFrame
Merge branch 'RefreshResSupportInCocos2dx' of git://github.com/chengstory/cocos2d-x into RefreshResSupportInCocos2dx

Conflicts:
	extensions/proj.win32/libExtensions.vcxproj.filters
change default tween value to true
Merge pull request #26 from 2youyouo2/RefreshResSupportInCocos2dx

update TimelineAction