Added 'reset password' button for admins.
Added protection against deleting a group membership that has assigned tasks.
Made task index page tolerate missing contact assignment.
Gave task show page the ability to tolerate a missing contact assignment.
Gave the tasks controller the ability to handle a missing contact assignment.
Added page to get email addresses of overdue task contacts.
Upgrade to Rails 3.2.11 to address security vulnerability.
Quick fix for confused Postgres DB on heroku, which seems to have an 'id' field.
Undo previous ineffective quick-fix.