Issue #5335: update AUTHORS.txt for v3.0 beta
Issue #5335: modify jsDoc tag @constructor
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-html5 into Iss5335_v30beta
Merge pull request #1878 from dingpinglv/Iss5335_v30beta

Issue #5335: update AUTHORS.txt for v3.0 beta and modify jsDoc tag @constructor