Bukkit

v3.0.10:

• Added Metrics
• Fixed a serious bug

v3.0.9:

• Fixed permissions
• Fixed bugs.
• Added Signs.
• Added clearer error messages. ( In console, when kit configuration contains error )
• Added Armor slot, autoequip armor.
• Added Flag: ClearInv (Removes armor and items).
• Added Portuguese and Italian translation ( Thanks: elcioebel and Salvo85 )

• Updated to 1.9.4
• Compiled with Java 8, Java 7 is no longer supported.

v3.0.7

• Fixed: PermissionOnly and Permission flag not saved

v3.0.6

• Fixed kit deletion.

v3.0.5

• Fixed error on startup ( 1.9 )

v3.0.4

• Added kits, akit, akits as an alias command.

v3.0.3

• Fixed small bugs

v3.0.2

• Added signs.
• Added max-uses flag.
• Updated to 1.9

v3.0.1

• Added a new subcommand: /kit edititem
• Replace all %player% string in lore and displayname.

v3.0.0

• Recoded plugin
• Added CustomEnchantments support.
• Added extra flags.
• Lot of fixes.

v2.1.3

• Fixed bug when setting the kit's icon.

v2.1.2

• Fixed error when starting the plugin.

v2.1.1

• Fixed errors and changed some config creating stuff.
• The language files are in the jar file, so you have to edit manually in the file.

v2.1

• Fixed problems when using the plugin with Spigot.
• Fixed some problems with the language files.

• Merged with GUIAPI. ( http://dev.bukkit.org/bukkit-plugins/guiapi/ )
• Added bypass permission: advancedkits.bypass.[kitname]

I didn't have any problem when I was testing it.
Tested on PaperSpigot|Spigot|CraftBukkit 1.8 - 1.9.4