removes useless code

Yavsc/ApiControllers/AccountController.cs

@@ -12,7 +12,6 @@ namespace Yavsc.WebApi.Controllers
     using ViewModels.Account;
     using Models.Auth;
     using Yavsc.Helpers;
-    using System;
     using System.Linq;
 
     [Authorize(),Route("~/api/account")]

Yavsc/ApiControllers/Musical/PodcastController.cs

@@ -1,10 +1,4 @@
-using System;
-using System.Collections.Concurrent;
-using System.Net.WebSockets;
-using System.Threading;
-using System.Threading.Tasks;
 using Microsoft.AspNet.Mvc;
-using Microsoft.Extensions.Logging;
 
 namespace Yavsc.ApiControllers
 {