Issue #4608: add a condition to CCBoot.js
Issue #4608: Additional judge, compatible with the delete method
Issue #4608: cc.color throw error
Merge branch 'develop-3.0' of https://github.com/VisualSJ/cocos2d-html5 into Iss4608_MinimizeCore
Issue #4608: fixed a mistake in CCTypes when Google Closure compiler mode is advanced.