account/credits: Change buttons that refer to 'add credit' to 'modify credit', to make it clear that both positive and negative values are allowed.
support: Allow statuses to be assigned to tickets, so OPEN/CLOSED can now specify what the ticket is waiting on - the client, staff, or a third party
Merge pull request #18 from nasonfish/ticketstatus

admins' adding credit form now displays as "modifying" credit, tickets now have statuses attached to them