extra tests for ok/ko signup, and also refactored flash message element in layout
added sessions controller
added integrationtest for authentication page
added routes for /signin, /signout and put empty new, create, destroy in sessions controller
passing tests for basic signin page
added remember_token to User model with callback before_create
users can sign in and out with persisitent sessions
user can sign in and out and use nav controls
added cucumber-rails and database_cleaner to gems
genereted cucumber materials
added cucumber scenarios for signing in with valid/invalid info
helper utilities for tests