npm install
npm start
open http://localhost:3000
https://medium.com/@learnreact/container-components-c0e67432e005#.raqbg4uq7
https://medium.com/@dan_abramov/smart-and-dumb-components-7ca2f9a7c7d0#.z32e1xlvi
https://www.youtube.com/watch?v=KYzlpRvWZ6c