added library grouping settings.

MediaBrowser.Model/Extensions/ListHelper.cs

@@ -0,0 +1,19 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace MediaBrowser.Model.Extensions
+{
+    public static class ListHelper
+    {
+        public static bool ContainsIgnoreCase(List<string> list, string value)
+        {
+            if (value == null)
+            {
+                throw new ArgumentNullException("value");
+            }
+
+            return list.Contains(value, StringComparer.OrdinalIgnoreCase);
+        }
+    }
+}