Changed CompositeCommand stack to queue

#story[1096]

racevisionGame/src/main/java/visualiser/gameController/ControllerServer.java

@@ -64,6 +64,7 @@ public class ControllerServer extends Observable implements Runnable {
                     BoatActionDecoder boatActionDecoder = new BoatActionDecoder(encodedMessage.getMessageBody());
                     action = boatActionDecoder.getBoatAction();
 
+                    // Notify observers of most recent action
                     this.notifyObservers();
                     this.setChanged();
                 }