环信集成官方文档
http://docs.easemob.com/im/300iosclientintegration/20iossdkimport
环信相关视频
http://www.imgeek.org/video/
其他文档
http://www.imgeek.org/article/825308225
http://www.jianshu.com/p/b0a0317a0a9f
iOS集成环信推送,最详细流程(证书创建、环信集成、测试)
http://blog.csdn.net/mumubumaopao/article/details/53423393
导入SDK出现的问题：
http://blog.csdn.net/one_person_one_life/article/details/52807931
导入EaseUI出现unknown type name 'NSString'解决
http://blog.sina.com.cn/s/blog_5c91824f0102vdut.html
