imported signalr 1.1.3 into NzbDrone.

src/Microsoft.AspNet.SignalR.Core/Messaging/Volatile.cs

@@ -0,0 +1,17 @@
+// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.md in the project root for license information.
+
+using System;
+using System.Threading;
+
+namespace Microsoft.AspNet.SignalR.Messaging
+{
+    // All methods here are guaranteed both volatile +  atomic.
+    // TODO: Make this use the .NET 4.5 'Volatile' type.
+    internal static class Volatile
+    {
+        public static long Read(ref long location)
+        {
+            return Interlocked.Read(ref location);
+        }
+    }
+}