update UsersController to re-enable logging in, support email and password params
update Users table to include a password and email field
add has_secure_password validation to User model
delete old two-user form
add migration to update users table with new fields for password and email
run new migrations and update the schema
add form for new users and a temporary form for user profiles
add SessionHelper methods for logging in/out
add form for user login
create SessionsController for managing login and logout
add routes for login, logout
include SessionsHelper in UsersController
fix redirect and add error handling for new user creation
update UsersController to re-enable logging in, support email and password params
update Users table to include a password and email field
add has_secure_password validation to User model
delete old two-user form
add migration to update users table with new fields for password and email
run new migrations and update the schema
add form for new users and a temporary form for user profiles