Issue #3501: update version number of Engine
Merge branch 'master' of https://github.com/cocos2d/cocos2d-js-tests into Iss3501_ReleasingV2.2.2
Issue #3501: corrected a mistake in XHRTest.js that all response labels show in one line.
Merge branch 'master' of https://github.com/cocos2d/cocos2d-js-tests into Iss3501_ReleasingV2.2.2
Merge pull request #271 from dingpinglv/Iss3501_ReleasingV2.2.2

Issue #3501: corrected a mistake in XHRTest.js that all response labels show in one line.