CCMutableArray optimization

[moadib]

Please look at this topic http://www.cocos2d-x.org/boards/6/topics/3164

[minggo]

You can not use
std::sort(pArray->begin(), pArray->end(), less);
in
CCTouchDispatcher::rearrangeHandlers()
or it may crash. You can refer bug #680

[minggo]

Oh, you use reserve(), so I think you are right. I will check the usage of insertObjectAtIndex(), and merge your pull request. Thank you.