Merge pull request #356 from SmallAiTT/tests_js_3.0_ccgame

Change some public api to private.  Remove some public api. Fix some bugs.
Fixed #3427: fixed a mistake that set a incorrect position
Merge branch 'tests_js_3.0' of https://github.com/cocos2d/cocos2d-js-tests into Iss3427_NewEventDispatcher
Merge pull request #357 from dingpinglv/Iss3427_NewEventDispatcher

Fixed #3427: fixed a mistake that set a incorrect position
Change `new XMLHttpRequire()` to `cc.loader.getXMLHttpRequest()` .