anchor.diff:      { 
           "game_id": '42',
           "player_id" : '31337',
  -        "hand" : [ {value: '2', suit:'diamonds']
  +         "hand" : {
  +            "player_id" : '31337' 
  +            "cards": [ {value: '2', suit:'diamonds'}]
  +            }
   
   ## Playing the Game [/play]
   
  
positive.code:     }
  
  + Response 200 (application/json)
  Once both players have chosen a card value, the server will resolve the round and update each player's hand
  
  + Response 401 
  player_id was invalid for the provided game_
  
  + Response 403 
  player_id did not have the selected card
negative.code: player_id was invalid for the provided game_
  
  ### Play a Card [POST]
  Choose a card value to play
  
  This choice can be freely changed until both playeres have chosen their card for this round
  
  Choosing to play the Ace of Spades will discard any card value while *also* discarding the opponent's card(s)
  
  + Parameters
      + game_id (required, number) - unique ID for the game
  