Sort invite codes by date

It would be good to sort the invite code list in admin mode by creation date, rather than it is now by code itself. Or provide buttons that you can use to sort either or.

assigned to @azul

as an admin I'd like to know how many invites were given out in the last week i.e.

with the current view, you cannot see this b/c invites are sorted by the code itself

mentioned in commit 47df0b29

mentioned in merge request !48 (merged)

mentioned in commit platform@099e4915

mentioned in merge request platform!133 (merged)

mentioned in commit platform@37f09aad

mentioned in commit platform@a96fefa7

closed via commit 92c5e35e

closed via commit 47df0b29

closed via merge request !48 (merged)

mentioned in commit 92c5e35e

changed milestone to %0.9.2