add gems for debugging
add mock omniauth info for tests
notify user when she has signed in successfully
add signout notification; refactor
add some content
separate first and last name

I think Omniauth gives us the first and last names separately. Add
first_name, last_name, and full_name methods to User.
fix annoying infelicities
add rb-readline to get rid of Guard error
add proposal model, factory, &c.