@ashfurrow => bids, countdowns and bid previews

* Adds the logic to place a bid, as I couldn't get the RAC signal passing to work I've just left it in a broken state. It will run through a lot of the networking to place a bid - but not all.

* Adds a countdown to the end of an auction. The Auction we work off has a broken end date, so it wil lalways show "closed" until it's fixed.

* Most fulfillment view controllers now have a bid preview at the top of the view

* Consolidates the artwork title and date to an attributed string that uses the standard formatting

*  Move a few tests to pending as I couldn't figure out why it was raising an exception or never looking like it was meant to.
It doesn't look like this signal is ever subscribed to, so it won't be executed. Is that correct?