Update README.md
Update README.md
Update chat demo.
Merge pull request #1 from ufosky/master

Update chat demo.
Update swift demo for xcode 6.
Merge pull request #2 from ufosky/master

Update swift demo for xcode 6.
Chat demo add photo sending.
Merge pull request #3 from ufosky/master

Chat demo add photo sending.
Add US datacenter support.
Demo update.
Merge pull request #4 from ufosky/master

Update demo.
AddRequest work
Merge branch 'master' into leanchat

Conflicts:
	AVOSChatDemo/AVOSChatDemo.xcodeproj/project.pbxproj
	AVOSChatDemo/AVOSChatDemo/CDAppDelegate.m
	AVOSChatDemo/AVOSChatDemo/controllers/contact/CDContactListController.m
	AVOSChatDemo/AVOSChatDemo/controllers/entry/CDLoginController.m
	AVOSChatDemo/AVOSChatDemo/settings/CDCommonDefine.h