Made custom fuel compatible with the Blast Furnace and Smoker. It can be toggled in the custom item settings under Fuel. You can for example only allow the fuel to work in Smoker, etc.
Bug Fixes:
Redesigned how the MetaData of items is checked. This may fix a annoying bug, where some recipes were not working at all after restarting.
Fixed the commands, they should work again. Make sure you have installed the latest Spigot version! It looks like there was an issue with commands in older builds.