imported signalr 1.1.3 into NzbDrone.

src/Microsoft.AspNet.SignalR.Core/Infrastructure/ExceptionsExtensions.cs

@@ -0,0 +1,28 @@
+// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.md in the project root for license information.
+
+using System;
+
+namespace Microsoft.AspNet.SignalR.Infrastructure
+{
+    internal static class ExceptionsExtensions
+    {
+        internal static Exception Unwrap(this Exception ex)
+        {
+            if (ex == null)
+            {
+                return null;
+            }
+
+            var next = ex.GetBaseException();
+            while (next.InnerException != null)
+            {
+                // On mono GetBaseException() doesn't seem to do anything
+                // so just walk the inner exception chain.
+                next = next.InnerException;
+            }
+
+            return next;
+        }
+    }
+}
+