closed #4529: Stroke size and shadow offset don't consider ContentScaleFactor
closed #4530: Using 'Outside stroke' instead of 'Inside Stroke' for Label generated by 'Font name'. And fix stroke could not work on iOS7.
LabelTest , changed stroke color  to blue.
Adds another test for stroke.
Merge branch 'develop-label-stroke' of https://github.com/dumganhar/cocos2d-x into develop_label_fixs
Modify layout and add Boxes
Merge branch 'develop' into develop_nutty_modifylayout_add_Boxes
label: Refactor implementation of shadow.
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-x into develop_label_fixs

Conflicts:
	cocos/2d/CCLabel.cpp
remove unused code and fixed warning.
Merge pull request #5991 from dumganhar/develop

Mac build fix after merging https://github.com/cocos2d/cocos2d-x/pull/5989
issue #4401, fix a typo
Merge pull request #5992 from andyque/fix_typo

issue #4401, fix a typo
Merge pull request #5980 from Dhilan007/develop_label2

Refactor implementation of label's shadow and fixed stroke was not 'outside stroke' for Label generated by 'Font name'
Update CHANGELOG [ci skip]
add use CCComRender as parent for attaching component
remove isRenderer.
use capital letters for enum.
1. Spirte -> Sprite.
2. _EMPTYNODE -> EMPTY_NODE.
Move layout "exe" to cpp