Merge pull request #1133 from dingpinglv/Iss2803_V2.1.6Release

Issue #2803: Updated CHANGELOG.txt and AUTHORS.txt, updated version number and fixed two bugs for releasing v2.1.6
Issue #2803: update submodule reference
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-html5 into Iss2803_V2.1.6Release