cleans using clauses

Yavsc/ApiControllers/AccountController.cs

@@ -1,20 +1,16 @@
-using System.Threading.Tasks;
-using Microsoft.AspNet.Identity;
+using Microsoft.AspNet.Identity;
 using Microsoft.AspNet.Authorization;
-using Yavsc.Models;
-using Yavsc.Models.Account;
 using Microsoft.AspNet.Mvc;
-using Yavsc.ViewModels.Account;
-using System.Security.Claims;
 using Microsoft.Extensions.Logging;
-using Yavsc.Models.Auth;
-using System.Collections.Generic;
-using static Yavsc.ChatHub;
-using Microsoft.Data.Entity;
-using System.Linq;
+using System.Security.Claims;
+using System.Threading.Tasks;
 
 namespace Yavsc.WebApi.Controllers
 {
+    using Models;
+    using Models.Account;
+    using ViewModels.Account;
+    using Models.Auth;
 
     [Authorize,Route("~/api/account")]
     public class ApiAccountController : Controller

Yavsc/ApiControllers/ChatApiController.cs

@@ -1,8 +1,6 @@
 
-using System;
 using System.Collections.Generic;
 using System.Linq;
-using Microsoft.AspNet.Authorization;
 using Microsoft.AspNet.Mvc;
 using Microsoft.Data.Entity;
 

Yavsc/Controllers/FrontOfficeController.cs

@@ -7,7 +7,6 @@ using Microsoft.Data.Entity;
 using Microsoft.Extensions.Logging;
 using Yavsc.Models.Booking;
 using Yavsc.Helpers;
-using Yavsc.Models.Billing;
 using System;
 
 namespace Yavsc.Controllers

Yavsc/Hubs/ChatHub.cs

@@ -18,12 +18,11 @@
 //
 //  You should have received a copy of the GNU Lesser General Public License
 //  along with this program.  If not, see <http://www.gnu.org/licenses/>.
-using System.Threading.Tasks;
 using Microsoft.AspNet.SignalR;
+using Microsoft.Data.Entity;
+using System.Threading.Tasks;
 using System.Collections.Generic;
 using System.Linq;
-using System;
-using Microsoft.Data.Entity;
 
 namespace Yavsc
 {

Yavsc/Model/Messaging/ClientProviderInfo.cs

@@ -1,6 +1,5 @@
 
 using System.ComponentModel.DataAnnotations;
-using System.ComponentModel.DataAnnotations.Schema;
 namespace Yavsc.Model
 {
     public class ClientProviderInfo