Game Engine todos

[ivangreene]

• [x] create new game - socket - 'newGame' - requires authentication
• [X] send a game move - socket - 'gameMove', gameId, move
• [X] find open games - express - /api/games?open=true
• [X] join game - socket - 'joinGame', gameId
• [X] start game - socket - 'startGame', gameId
• [ ] send hidden game state attributes after a move - socket
• [ ] send new hand to that user - socket

[ivangreene]

Move engine:

• [x] King logic
• [ ] Allow a card that normally requires a target to be played without a target when all other players are "protected" - same with guessed card