Cleaning end-of-line spaces
Added zlib note to readme
Untabify
Beginning of AI rewrite
Using `initialize-instance` for slugs

   Previously there was an `:after` method on the accessor of every
   field that needed to be intelligently initialized
Ignore various emacs and lisp junk
Mating and nutrition rebalance

   Mating now costs nutrition, and slugs start with enough food to
   survive a few turns.