Ref: wrap classes in module "WumpusHunt"
Add: message in case of protocol breach
Add: protocol breach test
Add: sample executable

To see the hunt in action, issue this command from the
lib directory:

ruby -I. wumpus.rb <hunter implementation.rb>
Add: Action#to_s
Add: Senses#to_s
Add: additional command line argument checks
Mod: increase kill count to 500 turns
Add: interactive hunter