Restful API Setup

- Removed [restless](https://flask-restless.readthedocs.org/en/latest/).
- Setup [RethinkDB](http://www.rethinkdb.com).
- Setup front-end routes and templates using [Jinja2](http://jinja.pocoo.org).
- Setup BREAD endpoints for product.

Closes #4 

(This is a work in progress. I will rebase and merge once complete.)