Bukkit

- Fixed bug: Player couldn'd add a repairable item to the stock of their playershop because of the repair cost (the exp. cost in a anvil is different, yet I ignore this value).

- There is a open bug I didn't fixed yet: Sometimes you can't add a item to a free slot in a shop because the slot is already occupied but it isn't. If you have this bug try to restart the server, this should help for this slot (I think).