fix portable and 3.5 project references

MediaBrowser.Model/Entities/SortOrder.cs

@@ -0,0 +1,17 @@
+namespace MediaBrowser.Model.Entities
+{
+    /// <summary>
+    /// Enum SortOrder
+    /// </summary>
+    public enum SortOrder
+    {
+        /// <summary>
+        /// The ascending
+        /// </summary>
+        Ascending,
+        /// <summary>
+        /// The descending
+        /// </summary>
+        Descending
+    }
+}