Bukkit

I've done my best to create a smart detection for the monster spawners. So all you need to do is somewhere in the name or lore display what it is so it could be as simple as having the name: Zombie Spawner or have its name be default and its lore saying: This is a finely crafted spawner for zombies. Examples of these would be:

Slot1:
    ItemID: 52
    ItemAMT: 1
    CustomName: '$cVillager Spawner'
    TokenCost: 100
    GiveItem: true
Slot2:
    ItemID: 52
    ItemAMT: 1
    CustomLore: '$aThis is a finely crafted spawner for zombies!'
    TokenCost: 150
    GiveItem: true