Roughing in Containers module

Container/containable editor templates appear
Container id settable via drop list
ContainerPathConstraint of higher priority providing list view

--HG--
branch : dev

src/Orchard.Web/Core/Containers/Services/ContainersPathConstraintUpdater.cs

@@ -0,0 +1,34 @@
+using System.Linq;
+using Orchard.ContentManagement;
+using Orchard.Core.Containers.Models;
+using Orchard.Core.Routable.Models;
+using Orchard.Environment;
+using Orchard.Tasks;
+
+namespace Orchard.Core.Containers.Services {
+    public class ContainersPathConstraintUpdater : IOrchardShellEvents, IBackgroundTask {
+        private readonly IContainersPathConstraint _containersPathConstraint;
+        private readonly IContentManager _contentManager;
+
+        public ContainersPathConstraintUpdater(IContainersPathConstraint containersPathConstraint, IContentManager contentManager) {
+            _containersPathConstraint = containersPathConstraint;
+            _contentManager = contentManager;
+        }
+
+        void IOrchardShellEvents.Activated() {
+            Refresh();
+        }
+
+        void IOrchardShellEvents.Terminating() {
+        }
+
+        void IBackgroundTask.Sweep() {
+            Refresh();
+        }
+
+        private void Refresh() {
+            var routeParts = _contentManager.Query<RoutePart, RoutePartRecord>().Join<ContainerPartRecord>().List();
+            _containersPathConstraint.SetPaths(routeParts.Select(x=>x.Path));
+        }
+    }
+}