Updated version 0.55

[BUGFIX] Sell to store notification appears even when you open and close the window without selling anything.

[UPDATE] Added new PriceParser helper class that saves and loads prices.xml using DOM.
[UPDATE - SOURCE] Removed PItem calss because of his redundancy: its functionality was replaced by Price class, because had the same data structure and scope.
[UPDATE] Structure of prices.xml changed for better integration with the ability to sell custom items (items with lore, enchants etc).

[FEATURE] Now you can sell and buy custom items with lore, enchants or else. You can add it with separate prices, they'll show in the prices list with name appended to base item name.
[FEATURE] Now you can add prices for items you're holding in hand: just type /rssetprices add hand:cost

[BUGS] The ability to use shopping minecarts and shipping was not tested and is surely broken. This will be fixed in the shortcoming update.
[BUGS] Probably broken the statistic system, will be fixed in the stable update.