Session3 -- mailroom check-in

Nearly done with mailroom.py.  Still need to add final if __name__ ==' __main__' block but the other components are finished so it seemed like a good time to check in.  
nice -- I like the separation of first and last names.

However, you may not want to use a tuple to store the donations, as you'll want to add to those -- so a mutable list is easier.