* Fixed error when a player quits with the GUI open.
* Fixed plugin not detecting item to be purchased.
* Fixed unserialize error after adding item to the shop.
* NBT::$replace now uses IntArrayTag to save the replaced block's damage.
* Added /cs removebyid <itemId> <itemDamage>
* Added "default-price" option in config.yml
* Added "banned-items" (These items are banned from being /cs add ed).
* Fixed many more bugs.