Random mob support

[timbru31]

Originally reported from Shano_dekono via the SpigotMC forums

I have a suggestion to add to the plugin, when crafting spawn cages if config is set to "defaultCreature: random" it will spawn random entity mob cages (creepers,skeletons,zombies etc) instead of set mobs.

[axemwa]

Yeah random mobs option would be handy thanks for considering it :D