Use webpack 2 and webpack-devserver

[Divjot Singh]

Since you don't have a backend, using webpack-devserver is better than ws and webpack -w.

Webpack 2 with treeshaking will hopefully provided smaller bundle size.

• webpack 2
• webpack-devserver
  • React hot reloading

[Divjot Singh]

#104 rewrite branch deals with it. Should ship with 0.6.0