imported signalr 1.1.3 into NzbDrone.

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

@@ -0,0 +1,15 @@
+// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.md in the project root for license information.
+
+using System;
+using System.Diagnostics;
+
+namespace Microsoft.AspNet.SignalR.Infrastructure
+{
+    [AttributeUsage(AttributeTargets.Property, AllowMultiple=false)]
+    internal sealed class PerformanceCounterAttribute : Attribute
+    {
+        public string Name { get; set; }
+        public string Description { get; set; }
+        public PerformanceCounterType CounterType { get; set; }
+    }
+}