Serialized KitItem in the most most effective way as well as removeing half the redundant code from the class
ItemStack, ItemMeta and Inventories all inherit Bukkits ConfigurationSerializable interface, meaning its all done for you. See kitItem for comments on why I removed certain lines and the easy it is to serializle plus this will work for ANY itemStack you created with the class. Feel free to revert it back you you really feel yours was the better solution, it only took me 20 mins to do the lot. I will be adding some more code in a week just let me know what you'd like doing.