Generate sessions controller.
Add a /login url and setup sessions routes.
Skeleton method names.
Add session_token column to users table.
Add some auth helper methods.
Add auth helpers and include them into ApplicationController.
Add sessions controller and.
Fix several typos in form.
Add some login form.
Fix #logged_in? bug and add greeting helper.
Fix some instance variable references to avoid NoMethodErrors.
Add a /login route for session creation.
Default users#show template.
Write some basic css.
Refactor and simplify User model.
Refactor and simplify controllers.
View bugfixes.
Add debugging gems.
Create links and short_codes tables.
Session helpers: #login, #logout, #current_user, #logged_in?