Merge pull request #1687 from dingpinglv/Iss4277_ReleaseV3.0

Fixed #4277: fixed a bug that UILoadingBar doesn't work on Scale9Sprite
Refactor #4365: Improve layers constructors
Refactor #4365: Refactor SpriteBatchNode constructor with init functionality
Refactor #4365: Refactor Menu and MenuItems constructor with init functionality
Merge branch '4365ctor' into develop-3.0
Merge pull request #1688 from pandamicro/develop-3.0

Refactor #4365: Refactor SpriteBatchNode, Menu, MenuItem constructor with init function
Refactor #4365: Fix bug
Merge pull request #1690 from pandamicro/develop-3.0

Refactor #4365: Fix bug
Fixed #4277: fixed a bug of UILoadingBar that its width is incorrect.