add is_banned field and change role to be string in user migration
add rails debugger gem
update links and add actions
add permissions service, remove permissions script and fix errors in path access validators
add default_user constant service
create user factory as model for server interactions
update auth service to use new user service
update register controller to use updated Auth service methods
add logout method to main controller
add errors notifications on registration form
add login controller and template
add errors filter for prettifying errors