Update submodules
Merge branch 'master' of https://github.com/cocos2d/cocos2d-js
Improve release note
Merge pull request #300 from pandamicro/master

Update submodules
Sync Cocos2d-x 3.0 final
Merge branch 'master' of https://github.com/cocos2d/cocos2d-js
Issue #4755: Improve PhysicsSprite adding logic
Merge commit '17c21ebbe5474bca4d1aeec905d697685ec1cdc0' into SMv28
Merge pull request #301 from pandamicro/master

Issue #4755: Improve PhysicsSprite adding logic
Feature #4916: Upgrade bindings generator to SpiderMonkey v28
Merge pull request #303 from pandamicro/SMv28

Feature #4916: Upgrade SpiderMonkey to v28 for android/mac/ios
Merge branch 'master' of https://github.com/cocos2d/cocos2d-js into spidermonkey28