Add checks to check for attempted duplicate additions of person, badge, assertion, or issuer to the db
pep 8 that comment
Add check in admin view to ensure a duplicate authorization will not be attempted
use new badge_name_to_id util function from tahrir-api
Merge pull request #286 from fedora-infra/feature/admin-check-dups

Add checks to check for attempted duplicate additions of things in admin panel.