http://swift.gg/2017/03/27/promises-in-swift/
http://www.cnblogs.com/feng9exe/p/9043715.html
https://zhuanlan.zhihu.com/p/20531896
http://www.cocoachina.com/swift/20160525/16437.html
https://blog.dianqk.org/2016/08/22/rxswift-vs-promisekit/
http://www.cnblogs.com/niithub/p/7487940.html
https://www.cnblogs.com/cbscan/articles/4143573.html
https://www.cnblogs.com/cbscan/articles/4143573.html
https://www.zhihu.com/question/39390484
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