Created admin page, added reminder email feature

- New admin page provides links to admin tools
- Changed email script so [RuddWeb] prefix is automatically added
- Renamed the access level AL_ADD_MEMBERS to AL_USER_ADMIN
- Renamed /secretary to /admin
- Created a page that lets admins email people who have not yet created
  accounts.
Cleaned up style, added optional arg to sendEmail

- sendEmail has optional usePrefix argument.
Merge pull request #35 from RuddockHouse/admin_changes

Created admin page, added reminder email feature