some changes

src/Yavsc/ApiControllers/GCMController.cs

@@ -37,6 +37,7 @@ public class GCMController : Controller
         _logger.LogError("Invalid model for GCMD");
         return new BadRequestObjectResult(ModelState);
       }
+      declaration.LatestActivityUpdate = DateTime.Now;
 
       _logger.LogInformation($"Registering device with id:{declaration.DeviceId} for {uid}");
       var alreadyRegisteredDevice = _context.GCMDevices.FirstOrDefault(d => d.DeviceId == declaration.DeviceId);

src/Yavsc/ApiControllers/Streaming/LiveApiController.cs

@@ -1,6 +1,4 @@
-using System;
 using System.Collections.Concurrent;
-using System.Collections.Generic;
 using System.Linq;
 using System.Net.WebSockets;
 using System.Security.Claims;
@@ -8,10 +6,8 @@ using System.Threading;
 using System.Threading.Tasks;
 using Microsoft.AspNet.Http;
 using Microsoft.AspNet.Mvc;
-using Microsoft.AspNet.SignalR;
 using Microsoft.Data.Entity;
 using Microsoft.Extensions.Logging;
-using Yavsc.Helpers;
 using Yavsc.Models;
 using Yavsc.Models.Streaming;
 using Yavsc.ViewModels.Streaming;