Webpack

Make building static assets for front end easier by automating all the things and splitting them up

- webpack
- gulp
- split into `priv/ui/app` for source and `priv/ui/public` for actual files for running static app
makes sense.

Will clean that up in https://github.com/envato/iodized/issues/17 I think there are some other broken things here too I need to investigate.