Fixed save method to be compatible with non-Windows servers
shelfit.admin now defaults to op
Proper handling of piston interactions
Proper item drops if shelf is destroyed via explosion
Protection to prevent shelf destruction via fire and explosions [Configurable]
Limit players to accessing shelves from the side only [Configurable]
Fixed shift-clicking items into shelves related bugs
Fixed rare bug that would lock all players out of shelves until server restart
Bookshelf inventories cannot be correctly access from the side of a shelf if that side has a sign on it, but all other sides will still function. [Will be corrected in v1.2]
