New: Filter .DS_Store files from parsing

Fixes #489

src/NzbDrone.Core/MediaFiles/DiskScanService.cs

@@ -64,7 +64,7 @@ namespace NzbDrone.Core.MediaFiles
             _logger = logger;
         }
         private static readonly Regex ExcludedSubFoldersRegex = new Regex(@"(?:\\|\/|^)(?:extras|@eadir|extrafanart|plex versions|\.[^\\/]+)(?:\\|\/)", RegexOptions.Compiled | RegexOptions.IgnoreCase);
-        private static readonly Regex ExcludedFilesRegex = new Regex(@"^\._|^Thumbs\.db$", RegexOptions.Compiled | RegexOptions.IgnoreCase);
+        private static readonly Regex ExcludedFilesRegex = new Regex(@"^\._|^Thumbs\.db$|^\.DS_store$", RegexOptions.Compiled | RegexOptions.IgnoreCase);
 
         public void Scan(Artist artist)
         {