Adding core Containers module

Container part used for content types that group child items together
Containable part provides UI to select which item is ContainerId

--HG--
branch : dev

src/Orchard.Web/Core/Containers/Controllers/ItemController.cs

@@ -0,0 +1,11 @@
+using System.Web.Mvc;
+using Orchard.Themes;
+
+namespace Orchard.Core.Containers.Controllers {
+    public class ItemController: Controller {
+        [Themed]
+        public ActionResult Display(string path, int? page) {            
+            return View();
+        }
+    }
+}