Merge pull request #19 from dunatotatos/master

Add "expired" string after an expired grant in order admin form.

Keep currently selected grant in admin form or Order.

Merge pull request #18 from dunatotatos/deactivate_grant

Merge pull request #17 from dunatotatos/alphabetical_requested

Display only active grants in order form.

Migrate database to match default strings in Python3.

Only modify queryset for user selection in order form.

Re-arrange order of users in "user" fields.

Merge pull request #16 from dunatotatos/ordered_date

Merge pull request #15 from dunatotatos/master

Automatically fill ordered_date or received_date to today.

Fix representation of models in admin interface.

Fix zip.reverse not being available in Python3.

Remove unicode mess from Python2.