Styled the subscription plan boxes
Added default usage of SimpleCov to spec_helper
Ignore test coverage reports
Clickable subscription plans, showing the details of the plan (which is pretty much the same as the index for now)
Added CSRF token meta tag to the application layout
WIP Handler for payments with credit/debit cards
Slightly changed the styles of subscription plans
Added environment variables file
Load database seeds when running specs
Route for creating payments with card
Minor style adjustments and added the card form (WIP)
WIP of Payments::CardsController
User#extend_subscription to extend the subscription period of a User
Added Guard gem
Updated Payments::CardsController to make tests green
Added the current user e-mail to the session partial
Added has_many :payments to the User model
Added styles to the payment form
Removed a no longer used form partial
Validations for Payment