Updates following 6/19 review meeting:
1) Fix up notification emails to the admin and new users.  Add Configure SMTP Wordpress plugin to aid in testing.
2) Support a new checkbox for closing County Public Trainings to new volunteers.  This is only visible to admins.
3) Fix the Volunteer export format by making it more strict with regards to the output columns.
4) Add link to update your registration if you want to change your tax site or training.
5) Add more detail on Step 4 of the wizard, when choosing a training.
6) In Find Free Tax Help - hide City poplist if County isn't selected.