Issue description:

Using a mob like MobStages, it comes up with the error that it doesn't recognize the entity id mekanism:babyskeleton. I want to temporarily stage baby skeletons to a later part of the game when they aren't as nightmarish since I have a prolonged early game in the pack where player's dont have hunger regeneration.

Would it be possible to register babyskeletons in the registry event for entities?

Version (make sure you are on the latest version before reporting):

Forge: 2739
Mekanism: 349
Other relevant version: Mob Stages 2.0.8

Just wanted to follow up on this, would this still be do-able?