Added signalR logout

Step/Controllers/WebApi/UserController.cs

@@ -8,6 +8,8 @@ using System.Linq;
 using static Step.Utils.LanguageController;
 using Step.Model.DTOModels;
 using System.Globalization;
+using Microsoft.AspNet.SignalR;
+using Step.Controllers.SignalR;
 
 namespace Step.Controllers.WebApi
 {
@@ -33,7 +35,9 @@ namespace Step.Controllers.WebApi
                 // Delete all the user session on the machine
                 sessionsController.DeleteSessionsByUserAndMachineId(Convert.ToInt32(machineId.Value), Convert.ToInt32(userId.Value));
             }
-
+            // Send to the clients the id of the disconnected user
+            var context = GlobalHost.ConnectionManager.GetHubContext<NcHub>();
+            context.Clients.All.logout(new { id = userId.Value });
             return Ok();
         }