Game - move quit handling logic back from MainRoom

sample/src/Game.cs

@@ -23,10 +23,11 @@ public Game(TextReader reader, TextWriter writer)
        public void Run()
        {
            using (CancellationTokenSource cts = new CancellationTokenSource())
            using (this.bus.Subscribe<SentenceMessage>(m => this.HandleQuit(m.Verb, cts)))
            using (new SentenceParser(this.bus, this.words))
            using (InputLoop loop = this.console.NewLoop())
            {
                Room room = new MainRoom(this.bus, cts);
                Room room = new MainRoom(this.bus);
                room.Enter();
                loop.Run(cts.Token);
            }
@@ -40,5 +41,16 @@ private static Words InitializeWords()
            w.Add(Verb.Take, "get");
            return w;
        }

        private bool HandleQuit(Word verb, CancellationTokenSource cts)
        {
            if (verb.Primary == Verb.Quit)
            {
                cts.Cancel();
                return true;
            }

            return false;
        }
    }
}

sample/src/MainRoom.cs

@@ -4,22 +4,16 @@

namespace Adventure.Sample
{
    using System.Threading;

    internal sealed class MainRoom : Room
    {
        private readonly CancellationTokenSource cts;

        public MainRoom(MessageBus bus, CancellationTokenSource cts)
        public MainRoom(MessageBus bus)
            : base(bus)
        {
            this.cts = cts;
        }

        protected override void EnterCore()
        {
            this.Register(Verb.Greet, (_, __) => this.Output("You say, \"Hello,\" to no one in particular. No one answers."));
            this.Register(Verb.Quit, (_, n) => this.cts.Cancel());
            this.Register(Verb.Take, (_, n) => this.Output("There is no " + n.Actual.ToLowerInvariant() + " here."));
        }
    }