Fixed an error generated by loading shops in a world that was changed.
Added ability to disable villager trading, so your established economies aren't ruined (<3 u Jeb)
Added coords and worlds for deleted shop messages (You will have to regenerate your config or add "It should be in '!world' at (!x, !y, !z)." to the end of the error message called "shop_removed")
Using SignShops that take or remove items from your inventory, with a written book in your inventory as well, will delete the contents of the book. There is no nice way for plugins to store the information written in books for 1.3 yet, so we cannot fix it until the Bukkit team updates their API.