Adding ContentType class and GetContentTypes methods to IContentManager and IContentProvider

--HG--
extra : convert_revision : svn%3A5ff7c347-ad56-4c35-b696-ccb81de16e03/trunk%4042626

src/Orchard.Web/Packages/Orchard.Users/Models/User.cs

@@ -3,6 +3,8 @@ using Orchard.Security;
 
 namespace Orchard.Users.Models {
     public sealed class User : ContentPart<UserRecord>, IUser {
+        public readonly static ContentType ContentType = new ContentType { Name = "user", DisplayName = "User Profile" };
+
         public int Id {
             get { return ContentItem.Id; }
         }