Fixed #5549: [JSB] support ScrollView for clipping its content
Fixed #5561: fix addChild issues in Widget's addChild function
Fixed #5561: [2.x]Fix addChild issues in Layout and ScrollView's addChild function
Fixed #5561: [2.x]Fix addChild issue in Widget's addChild function
Merge pull request #7051 from pandamicro/v2

Bug Fixes
fix layout color and opacity issue
Merge pull request #7083 from andyque/fixOpacityColorPosition

fix layout color and opacity issue
fix timeline
fix ui animation
Merge pull request #7084 from andyque/fixUIAnimation

fix timeline and ui animation bug
enable display of stats
fixed crash on test case of spine.
Fixed #5561: [2.x]Fix other addChild/removeChild issue in UI
Merge branch 'v2' of https://github.com/cocos2d/cocos2d-x into UI_addChild_fix
Fixed #5561: [2.x]Fix some issue
Merge pull request #7082 from Dhilan007/v2-224

fixed crash on test case of spine.
Merge pull request #7088 from MSOpenTech/fix-v2-stats

Fix v2 stats
Fixed #5561: [2.x]Fix js tests compilation issue
Merge pull request #7089 from pandamicro/UI_addChild_fix

Fixed #5561: [2.x]Fix other addChild/removeChild issue in UI
fixed can't move app to SD card after installed on android.