Merge pull request #268 from htlxyz/v3quick_develop

V3quick develop
fix #259: enable cc.WebSocket for mac player
fixed #272: compile error with Xcode 6
Merge pull request #277 from htlxyz/v3quick_develop

sync code form v3quickcocos
修复ccsuiloader size分辨率适配bug
Merge pull request #281 from song920/v3quick_develop

修复ccsuiloader size分辨率适配bug