Making all of the view models not inherit from BaseViewModel

--HG--
branch : dev

src/Orchard.Web/Modules/Orchard.Roles/ViewModels/RoleCreateViewModel.cs

@@ -1,10 +1,9 @@
 using System.Collections.Generic;
 using System.ComponentModel.DataAnnotations;
-using Orchard.Mvc.ViewModels;
 using Orchard.Security.Permissions;
 
 namespace Orchard.Roles.ViewModels {
-    public class RoleCreateViewModel : BaseViewModel {
+    public class RoleCreateViewModel  {
         [Required]
         public string Name { get; set; }
         public IDictionary<string, IEnumerable<Permission>> FeaturePermissions { get; set; }