Fix Deck#shuffle spec to test four cards
Fix Deck#shuffle spec to test four cards

If you only test one card to see if
the deck was shuffled, you have a 1
in 52 chance of the test randomly
failing. By testing the first four
it is statistically really unlikely
they will have retained their default
order.

chris-nelson-mn/cashino-blackjack,chris-nelson-mn/cashino-blackjack,chris-nelson-mn/cashino-blackjack