Issue #2803: add a sample game link to index.html
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-html5 into Iss2803_V2.1.6Release
Merge pull request #1144 from dingpinglv/Iss2803_V2.1.6Release

Issue #2803: add a sample game link to index.html