follow instructions in https://www.twilio.com/blog/2015/08/setting-up-react-for-es6-with-webpack-and-babel-2.html
add react-router from https://github.com/rackt/react-router/blob/master/examples/webpack.config.js
to run webpack-dev-server --progress --colors http://localhost:8080/webpack-dev-server/
enable es6+ in babel (stage 0) http://babeljs.io/blog/2015/06/07/react-on-es6-plus/ use arrow function (very useful) https://github.com/babel/babel-loader