Merge pull request #1947 from pandamicro/develop

Feature #3949: Refactor cc.pool from class to singleton object
fixed the setter bug
Merge pull request #1948 from wuzhiming/ccpool

fixed the setter bug
Merge pull request #1949 from pandamicro/develop

Release #5636: Update engine version
Release #5636: Update build.xml for closure compiler
Merge branch 'develop' of git://github.com/cocos2d/cocos2d-html5 into develop