Merge pull request #68 from chuanweizhang2013/master

fixed some bugs
Merge pull request #69 from chuanweizhang2013/master

update js
Merge pull request #70 from chuanweizhang2013/master

modify version.json
Merge branch 'master' of https://github.com/chuanweizhang2013/cocos2d-js
Merge branch 'master' of https://github.com/chuanweizhang2013/cocos2d-js
prebuit os