Bukkit

v1.69 for MC 1.9.x, 1.8.x, 1.7.10

• Updated for MC 1.9.
• Removed support for nearly all versions of MC 1.7. Only v1.7.10 is still supported.

• Added setting 'skip-custom-head-saving' (default: true), which allows turning of the skipping of custom player head items (player heads with custom texture property and no valid owner) during saving of shopkeeper trades. Note: Best you keep this enabled for now, because disabling this on a server which does not properly support saving of custom player head items, can cause all your saved shopkeepers to get wiped. On newer versions of spigot the wiping of saved shopkeepers might be fixed, however custom player head items are still not properly supported by spigot, so they will basically get saved like if they were normal player head items.
• Fixed: No longer considering normal player heads without any owner as 'custom' player heads
• Added: Shopkeepers now get assigned a 'session id', which is much shorter than the unique id, but is only valid until the next server restart or the next time the shopkeepers get reloaded from the save file. Those ids are currently unused, but might get used in the future to let players (admins) specifiy a shopkeeper in commands via these shorter ids.

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.