Added a User model
Added validations over user's names and emails
Added the password_digest to the User table
Added secure password validation
Added validations for passwords
Full secure password implementation
Small change to the before_save user callback
Added debug information to the application's layout
Added user's show page
Created the form for submitting a new user
Added validation on the submission of the form
Added the signup functionality for a valid form
Add SSL in production
Precompiled assets for Heroku
Added integration tests to the Sign up page