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/Providers/Indexer/IndexerBase.cs

@@ -247,6 +247,7 @@ namespace NzbDrone.Core.Providers.Indexer
             {
                 episodeParseResult.Age = DateTime.Now.Date.Subtract(item.PublishDate.Date).Days;
                 episodeParseResult.OriginalString = title;
+                episodeParseResult.SceneSource = true;
             }
 
             _logger.Trace("Parsed: {0} from: {1}", episodeParseResult, item.Title.Text);