closed #3789: EventDispatcher supports sorting listeners by global Z and local Z order. And adds relevant test case.
Merge pull request #5136 from dumganhar/iss3789-dispatcher-global-z

closed #3789: EventDispatcher supports sorting listeners by global Z and local Z order. And adds relevant test case.
fix crash cause by string(null).
Merge pull request #5137 from Dhilan007/develop_crash

fix crash cause by string(null).
closed #2572, The arithmetic of child's position in ParallaxNode::addChild() is wrong.
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-x into develop