support dvd without video_ts folder

MediaBrowser.Controller/Entities/IHasImages.cs

@@ -21,6 +21,12 @@ namespace MediaBrowser.Controller.Entities
         /// <value>The path.</value>
         string Path { get; set; }
 
+        /// <summary>
+        /// Gets the file name without extension.
+        /// </summary>
+        /// <value>The file name without extension.</value>
+        string FileNameWithoutExtension { get; }
+
         /// <summary>
         /// Gets the identifier.
         /// </summary>