Hide remove admin button if only one admin left
Add check in backend for > 1 admin when trying to remove an admin
Remove Join button from queue list if not logged in
Change to ForbiddenException when trying to remove the last admin
Fix existing tests that failed due to removing the last admin, and implement new test case.
Change checks and remove '!' in exception message
Merge pull request #105 from mvk13ogb/one-admin-minimum

One admin minimum