Bidding on items continuation
Fixed the bidding. Bidding "not having an actual effect" was in reality a bug related to item indexing, which occurred when trying to call order_by() in query. Bug was fixed by adding indexes in Bid model (see the 'meta' variable in the model).
Other additional changes are:
- handled viewing item page when auction had closed without winning bid
- index page now shows the actual price, rather than the winning bid
- item page shows now bot actual price and starting bid
- item page now shows a message if user's bid is currently the winning bid