Some reformatting and cleaning of the sign_up_form.  Included email in
the addUser method.
Added some user input checks for signing up.  We now check if passwords
match and check if the applicant read the terms of use.  Still need to
check username availability, captcha, and password strength.
Added sign up confirmation page
Reformatted the log in/sign up page.  The architecture there is now more
similar to the sign up form page.  Also added a check that all fields
are filled in the sign up form.