After signing up the user is returned to the home page
Remove extraneous blank line from source code
Rename 'log/logged in' to 'sign/signed in'
Save user id in session
Move sign out link from home page to main menu
Rename login/logout to sign in/sign out
Write and pass sessions controller tests
Add refactor sign_up_test TODO
Split home_page_test into home_page_test and main_menu_test
Display signed in user's email on main menu bar