issue #3541 : Update cocos2d_externs.js
issue #3541 add button/checkBox  test for NPM test
Merge pull request #1449 from SmallAiTT/iss3541_4_testCase

issue #3541 : Update cocos2d_externs.js
Merge pull request #1450 from xingsenma/NPM

issue #3541 add button/checkBox test for NPM test
Fixed several bug on firefox
Added github repo ribbon