Bukkit

v1.70 for MC 1.9.x, 1.8.x, 1.7.10

• Ignoring off-hand interaction events at various places. The shop creation item will only act as such if it is held in the main hand. In the off-hand it will act like the normal item (and regular usage is prevented like normal via the 'prevent-regular-usage' setting).

Notice about an issue with MC 1.9

MC 1.9 has changed how the different spawn eggs are differentiated internally. All spawn eggs now have the data value 0 and there is no API in bukkit yet which would allow me to check which type of spawn egg a player is holding.
In order to get the shop creation via item working for now, you will have to either change the data value of the shop creation item to 0 (which will however let ALL types of spawn eggs act like the creation item), or you change the creation item type all together.

• If the trade for a written book fails players can sometimes still open and read the book if they close the shop and click the temporary fake book in their inventory fast enough. There is not much I can do about this..
• Server crashes and improper shutdowns might cause living non-citizens shopkeeper entities to duplicate sometimes.
• The 'always-show-nameplates' setting is no longer working on MC 1.8.
• Compatibility with older bukkit versions is untested. If you encounter any problems let me know and I will look into it.
• A bunch of entity types are only meant for experimental usage. They might cause all kinds of issues if used. See changelog of v1.50.
• In the latest MC 1.8.x versions default minecraft trading logic has slightly changed (and by that those of shopkeepers as well): if a trade requires an item with special data (like a custom name, etc.) minecraft is now only allowing this trade, if the offered item is perfectly matching, including all special item data and attributes.
• MC 1.9 has changed how the different spawn eggs are differentiated internally. All spawn eggs now have the data value 0 and there is no API in bukkit yet which would allow me to check which type of spawn egg a player is holding. In order to get the shop creation via item working for now, you will have to either change the data value of the shop creation item to 0 (which will however let ALL types of spawn eggs act like the creation item), or you change the creation item type all together.