envify react in production

Made the mistake to include the development build of react in the production build. Fixed by setting process.env manually to production in makewebpackconfig.js

Thx to @gaearon for https://twitter.com/dan_abramov/status/592692202335301636

Offline first

Using a ServiceWorker, the AppCache and a manifest, apps written with the react-boilerplate are now fully offline-first. They work without a network connection after the first load, and can be added to the homescreen on Chrome for Android. More information and the documentation can be found in the README!

Add explanation to setup page

v2.0.0 update

- Switched to Webpack as a build tool to be able to use hot reloading
- Added hot reloading
- Added unit testing
- Updated Documentation
- Added better demo