Update Gemfile.lock for Heroku
Configure database.yml
Add unicorn and a Procfile for heroku deployment
Add ruby version to Gemfile
Configure travis to deploy on heroku
Switch from unicorn to puma
Feature: List concerts
Scenario for when the is not scrobbling his/her music to last.fm

- Add capybara to Gemfile
- Add route for root path
- Add successfull feature for retrieving concerts if the user is not scrobbling