Fix: SignalR Authorize & Firefox Compatibility

Changes in architecture to support authorization and temporary
workaround for NTLM in Firefox (to be removed in SignalR 2.x). Thanks to
@davidfowl

Disco.Web/Areas/Public/PublicAreaRegistration.cs

@@ -1,6 +1,7 @@
 using System.Web.Mvc;
 using System.Web.Routing;
 using Microsoft.AspNet.SignalR;
+using Disco.BI.Interop.SignalRHandlers;
 
 namespace Disco.Web.Areas.Public
 {
@@ -16,8 +17,8 @@ namespace Disco.Web.Areas.Public
 
         public override void RegisterArea(AreaRegistrationContext context)
         {
-            context.Routes.MapConnection<BI.Interop.SignalRHandlers.UserHeldDevices>(
-                "Public_UserHeldDevices_Notifications", "Public/UserHeldDevices/Notifications");
+            context.Routes.MapConnection<UserHeldDeviceNotifications>(
+                "Public_UserHeldDevices_Notifications", "Public/UserHeldDevices/Notifications", new ConnectionConfiguration(), SignalRAuthenticationWorkaround.AddMiddleware);
 
             context.MapRoute(
                 "Public_Credits",