Fix NullPointerException on disable Mole and fix #2

Hi.
I fix two bugs on LotsOMobs.

main/java/com/lom/lotsomobscore/handler/ConfigHandler.java
main/java/com/lom/lotsomobsinit/LotsOMobsBiomes.java
Fixes in these files is for #2 

main/java/com/lom/lotsomobscore/handler/LotsOMobsEventHandler.java
Fixes in this file is supress NullPoninterException on disabling Mole.
And I think that should use world's random instance, so I fix it.

And I think that you should specify license of this mod in this repository.
If you can, please do it.
btw, my pull request is public domain :)

And if you can, please push 3.0.1b source.

Sorry for my english and I hope to merge this :)