remove all event listeners when CCNode destroy
Merge commit '8f6125ad3f611ad4ffd94832d903fb8cdb85926a'

* commit '8f6125ad3f611ad4ffd94832d903fb8cdb85926a':
  remove all event listeners when CCNode destroy

Conflicts:
	lib/cocos2d-x/cocos2dx/cocoa/CCEventDispatcher.cpp
	lib/cocos2d-x/cocos2dx/cocoa/CCEventDispatcher.h