https://www.zhihu.com/question/24590883
https://www.zhihu.com/question/20501628
http://blog.csdn.net/qiqll/article/details/39339319
http://blog.csdn.net/xiao_qiang_/article/details/3006801
http://itchat.readthedocs.io/zh/latest/
原文：http://www.cnblogs.com/kex1n/p/5986562.html