Sign in/out - initial tests, routes, controller actions, and views
Sign in/out - sign in - TDD Red
 Sign in/out - sign in - form and noop action
Sign in/out - sign in - sign in failure
Sign in/out - sign in - sign in failure, fix flash
 Sign in/out - sign in - sign in success with permanent session
Sign in/out - sign in - layout links for signed-in users, TDD Green
Sign in/out - sign in - signin upon signup
Sign in/out - sign out