Merge branch 'fix_inclusion_phys'
why not search _toAddedListeners??
Adding more tests for EventDispatcherTest.
Merge commit 'refs/pull/4069/head' of git://github.com/cocos2d/cocos2d-x into eventdispatcher-fix
closed #3106: Update NewEventDispatcherTest.cpp.
closed #3106: fixed: EventListeners can't be removed sometimes.
Merge pull request #4072 from dumganhar/eventdispatcher-fix

closed #3106: EventListeners can't be removed sometimes