Add ActiveAdmin gem.
ActiveAdmin migrations.
Register models with ActiveAdmin.
ActiveAdmin tests.
ActiveAdmin routes.
ActiveAdmin assets.
Remove duplicate call.
Edit models and decorators to support admin filtering by user fullname.
Give admin users first and last names.
Add validation to AdminUser.
AdminUser specs.
Fix routing.
Update schema.
Fix redirect on login.
Remove AdminUser model.
Add is_admin flag to User model.
Fix routes for admin Users.
Fix routes after removing AdminUser model.
Add admin authentication specs.
Remove AdminUser table from database.