defined drawTail() method and added it to drawWholeBody()
Merge branch 'master' into catsrabbits
Merge branch 'master' into catsrabbits
Cat: no changes, really
added interface CritterGroup and implementing classes CatGroup and
RabbitGroup for collections of cats and rabbits. 
Updated BatsEverywhere to include CritterGroup implementing classes. 
Updated Critter move() method so Critters don't go out of the bounds of
town and turn to a different direction to move instead