Update to Rails 4.0.4
Update Rails to 4.1.6. And add boot.rb file.
Implement ActiveRecord.
Implement instance level table_name method.
Implement User.all.
Explain new
Implement a simplified Sinatra.
Implemement the Application rack app.
Add UsersController and implement a Router.
Implement filtering logic.
Uncomment filtering tests.
Implement after_action.
Implement view rendering.
Refactor Filtering using ActiveSupport.
Add validation.