Add Camminantus Camminantus to fridge
Move skewing gene to position 7 in chromosome

This breaks backwards DNA compatibility, so I also cleaned the fridge of
old creatures.
Give unique id to DNA
Add Clades and DNA observers
Persist clades to file
Refactor Clades to be the new GenePool
Isolate narjillo as DNA JSON
Fix bug in GenePool serialization