Cleaned up using directive

src/Microsoft.AspNet.SignalR.Owin/Infrastructure/Headers.cs

@@ -2,7 +2,6 @@
 
 using System;
 using System.Collections.Generic;
-using System.Linq;
 
 namespace Microsoft.AspNet.SignalR.Owin.Infrastructure
 {

src/Microsoft.AspNet.SignalR.Owin/Resources.Designer.cs

@@ -9,9 +9,6 @@
 //------------------------------------------------------------------------------
 
 namespace Microsoft.AspNet.SignalR.Owin {
-    using System;
-    
-    
     /// <summary>
     ///   A strongly-typed resource class, for looking up localized strings, etc.
     /// </summary>

src/Microsoft.AspNet.SignalR.Owin/ServerRequest.cs

@@ -7,7 +7,6 @@ using System.Security.Principal;
 using System.Threading;
 using System.Threading.Tasks;
 using Microsoft.AspNet.SignalR.Owin.Infrastructure;
-using Microsoft.AspNet.SignalR.Hosting;
 
 namespace Microsoft.AspNet.SignalR.Owin
 {

src/Microsoft.AspNet.SignalR.Owin/ServerResponse.cs

@@ -6,7 +6,6 @@ using System.IO;
 using System.Threading;
 using System.Threading.Tasks;
 using Microsoft.AspNet.SignalR.Hosting;
-using Microsoft.AspNet.SignalR.Owin.Infrastructure;
 
 namespace Microsoft.AspNet.SignalR.Owin
 {