Added user priorities for nametag groups. The lowest order is on top.
Added the possibility to use inventory types other than chests in menus. Just set the size to a bukkit InventoryType.
Added the option to enable/disable inventory clicking (canceled by default).
False could be used to let players take items out of the menu.
Fixed a bug for 1.8 and 1.9 users where the plugin would throw errors when books were created.
Fixed some bugs regarding the custom events.
Fixed a typo for custom item's cooldown message.