A couple improvements regarding navigation

- Blogs can be added to the main menu
- Add permission checks to show/hide the menupart editors as needed
- Remove the unnecessary root node "main menu" when building the main menu

--HG--
branch : dev

src/Orchard.Web/Core/Navigation/Models/MenuPartDriver.cs

@@ -1,15 +1,30 @@
 using JetBrains.Annotations;
 using Orchard.ContentManagement;
 using Orchard.ContentManagement.Drivers;
+using Orchard.Security;
 
 namespace Orchard.Core.Navigation.Models {
     [UsedImplicitly]
     public class MenuPartDriver : ContentPartDriver<MenuPart> {
+        private readonly IAuthorizationService _authorizationService;
+
+        public MenuPartDriver(IAuthorizationService authorizationService) {
+            _authorizationService = authorizationService;
+        }
+
+        public virtual IUser CurrentUser { get; set; }
+
         protected override DriverResult Editor(MenuPart part) {
+            if (!_authorizationService.TryCheckAccess(Permissions.ManageMainMenu, CurrentUser, part))
+                return null;
+
             return ContentPartTemplate(part, "Parts/Navigation.EditMenuPart").Location("primary", "9");
         }
 
         protected override DriverResult Editor(MenuPart part, IUpdateModel updater) {
+            if (!_authorizationService.TryCheckAccess(Permissions.ManageMainMenu, CurrentUser, part))
+                return null;
+
             updater.TryUpdateModel(part, Prefix, null, null);
             return ContentPartTemplate(part, "Parts/Navigation.EditMenuPart").Location("primary", "9");
         }

src/Orchard.Web/Core/Navigation/Models/MenuPartHandler.cs

@@ -8,7 +8,7 @@ namespace Orchard.Core.Navigation.Models {
     [UsedImplicitly]
     public class MenuPartHandler : ContentHandler {
         public MenuPartHandler(IRepository<MenuPartRecord> menuPartRepository) {
-            Filters.Add(new ActivatingFilter<MenuPart>("blogpost"));
+            Filters.Add(new ActivatingFilter<MenuPart>("blog"));
             Filters.Add(new ActivatingFilter<MenuPart>("page"));
             Filters.Add(StorageFilter.For(menuPartRepository));
 

src/Orchard.Web/Core/Navigation/Services/MainMenu.cs

@@ -19,8 +19,7 @@ namespace Orchard.Core.Navigation.Services {
             foreach (var menuPart in menuParts) {
                 if (menuPart != null ) {
                     MenuPart part = menuPart;
-                    builder.Add("main menu", "1",
+                    builder.Add(menu => menu
-                                menu => menu
                                             .Add(part.MenuText, part.MenuPosition));
                 }
             }