Overloading ContentPart to optionally have new shape passed in

If lambda takes an argument, it is dynamic, and is an uninitialized shape of the named type
ShapeHelper and IShapeHelperFactory are obsolete - IShapeFactory itself is now dynamic

--HG--
branch : dev

src/Orchard.Web/Modules/Orchard.Users/Controllers/AdminController.cs

@@ -22,12 +22,12 @@ namespace Orchard.Users.Controllers {
             IOrchardServices services,
             IMembershipService membershipService,
             IUserService userService,
-            IShapeHelperFactory shapeHelperFactory) {
+            IShapeFactory shapeFactory) {
             Services = services;
             _membershipService = membershipService;
             _userService = userService;
             T = NullLocalizer.Instance;
-            Shape = shapeHelperFactory.CreateHelper();
+            Shape = shapeFactory;
         }
 
         dynamic Shape { get; set; }