Merge pull request #706 from pandamicro/develop

Sync Master to Develop
Refactor #5808 : remove plugin configure for Facebook plugin
Merge pull request #708 from joshuastray/fb_refactor

Refactor #5808 : remove plugin configure for Facebook plugin
Issue#2107: Add test case
Merge pull request #711 from VisualSJ/develop

Issue#2107: Add test case (UILoadingBarTest)