Integrate new rails conventions && update readme

Hello

I have updated the app to use rails conventions such as partials using a gem. I have also set up the newest bootstrap navbar and done away with the dropdown caret for the Username because the edit functionality wasn't written. I also made it possible to deploy to Heroku, among other places, using the pg and rails_12factor gems.

Please see my current fork or check out a live demo of my version here: https://murmuring-wildwood-8433.herokuapp.com/

I hope this is helpful to you!

Thank you,
-J. Sawyer