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Merge branch 'master' of https://github.com/easemob/sdkexamples-ios

# By winterSleep
# Via winterSleep
* 'master' of https://github.com/easemob/sdkexamples-ios:
  修改收到离线消息时, 消息混乱的bug

Conflicts:
	ChatDemo-UI2.0/ChatDemo-UI2.0/Class/Chat/ChatView/ChatViewController.m