Cleanup and updates for XEM

SceneSource added to signify to lookup via scene name
Use Episodes for naming instead of EpisodeNumbers (in ParseResult)

NzbDrone.Core/Repository/Series.cs

@@ -50,6 +50,8 @@ namespace NzbDrone.Core.Repository
 
         public DateTime? CustomStartDate { get; set; }
 
+        public bool UseSceneNumbering { get; set; }
+
         /// <summary>
         /// Gets or sets a value indicating whether this <see cref="Series"/> is hidden.
         /// </summary>