Fix for Appointment Mailer

There was an trailing comma on the defaults causing the error (like what @elskwid showed us yesterday).  There were a couple other minor errors that showed up once that was fixed.  The only notable one was in the mail templates, as @appointment.service.service_description isn't in the Appointment model (unless I messed up the database) so the call was changed to @appointment.service.  The app will still fail on an appointment post, but is now failing on the smtp auth. I will try testing it with a mail server tomorrow.