Dealer class

i'm not quite sure what this is testing. if you want to test the players got their initial two cards, you could check the player's hand to see if they have cards. ex:

```
player = Player.ew
deck = Deck.new
dealer = Dealer.new(deck, player)
dealer.deal!

dealer.players.each |player|
  player.hand.size.should == 2 #assert each player has two cards
end
```