CRM-12884: With basic Project BAOs in place, we can update the Volunteer tab to:
  1. Actually create Projects in the db
  2. Prepopulate the form with the Project's stored is_enabled status
CRM-12884: Change tab name to "Volunteers."
Merge pull request #23 from fjg-conflux/CRM-12884-2

CRM-12884: Updated form to use Project BAOs now that they exist. Changed name of Event tab.