modify rendmode
Merge branch 'master' of https://github.com/cocoscodeide/cocos2d-js
Merge branch 'master' of https://github.com/cocos2d/cocos2d-js
add get platform
Merge branch 'master' of https://github.com/cocoscodeide/cocos2d-js
Merge pull request #68 from chuanweizhang2013/master

fixed some bugs