Upgrade to rspec 2.14.0rc1 so I can use spies
Add rspec to rakefile
Implement spec for message translator

It's a bit odd, because the Blather callback expects a block...

AuctionMessageTranslator is a module, and its `for` method returns a
lambda, which is called when a message is received.
Use AuctionMessageTranslator in Main
Handle price and close events properly
Eevent format constants are only used in fake auction server, so move them there
Separate out WIP features
Add silly success message to rake
Add chapter tag links to readme