https://medium.com/react-native-training/redux-4-ways-95a130da0cdc
https://github.com/markerikson/react-redux-links/blob/master/redux-side-effects.md
http://blog.jakegardner.me/redux-thunk-vs-saga/
redux 4 ways examples
原文：http://www.cnblogs.com/skating/p/7852868.html
