Be fully compliant with UNO rules regarding game-starting card

[dgw]

Currently this game will keep drawing top cards at the start of a round if a W or WD4 comes up. The UNO rules specify that the start of a round should be handled as follows:

STARTING A DISCARD PILE
Well, if a word card is the first one turned up from the DRAW pile, this is what happens.
Wild Draw Four - It's put back in the deck and another one is chosen.
Wild Card - The player to the left of the dealer calls out a color - then plays.
Draw Two Card - The player to the left of dealer must pick two cards and then the next player goes (sad, but true).
Reverse Card - The dealer plays first, but then goes to the right instead of the left.
Skip Card - The player to the left of dealer doesn't start (get it, he's skipped). The player to the left of him starts.

— http://www.wonkavator.com/uno/unorules.html

Make sure to verify that all of these rules are being followed, in addition to adding the W and WD4 logic. Will probably reduce the elegance of the code somewhat because cardPlayed() or deal() or something in UnoGame will have to handle prompting for a color if the first card is W.