Added a VirtualFolder entity, a resolver, and a CollectionType property.

MediaBrowser.Controller/Resolvers/VirtualFolderResolver.cs

@@ -0,0 +1,41 @@
+using System.ComponentModel.Composition;
+using System.IO;
+using MediaBrowser.Controller.Events;
+using MediaBrowser.Model.Entities;
+
+namespace MediaBrowser.Controller.Resolvers
+{
+    [Export(typeof(IBaseItemResolver))]
+    public class VirtualFolderResolver : BaseFolderResolver<VirtualFolder>
+    {
+        protected override VirtualFolder Resolve(ItemResolveEventArgs args)
+        {
+            if (args.IsFolder && args.Parent != null && args.Parent.IsRoot)
+            {
+                return new VirtualFolder();
+            }
+
+            return null;
+        }
+
+        protected override void SetItemValues(VirtualFolder item, ItemResolveEventArgs args)
+        {
+            // Set the name initially by stripping off the [CollectionType=...]
+            // The name can always be overridden later by folder.xml
+            string pathName = Path.GetFileNameWithoutExtension(args.Path);
+
+            string srch = "[collectiontype=";
+            int index = pathName.IndexOf(srch, System.StringComparison.OrdinalIgnoreCase);
+
+            if (index != -1)
+            {
+                item.Name = pathName.Substring(0, index).Trim();
+
+                item.CollectionType = pathName.Substring(index + srch.Length).TrimEnd(']');
+            }
+
+            base.SetItemValues(item, args);
+        }
+
+    }
+}