Feature #4313: Implement NodeGrid
Feature #4313: add inline doc to cc.NodeGrid.create
Merge branch 'develop-3.0' of git://github.com/cocos2d/cocos2d-html5 into develop-3.0
Feature #4313: Adapt NodeGrid to -x API
Update copyright info
Merge pull request #1661 from pandamicro/develop-3.0

Feature #4313: Implement NodeGrid