Exclude dotfiles

Make sure that dotfiles are not included in the feed generation.
Sometimes extended attributes are saved in dotfiles with the same
suffix. Those files are now excluded by default and no longer clutter up
the feed.

index.php

@@ -155,7 +155,7 @@
         /**
          * Make sure file matches extensions from array
          */
-        if (array_key_exists(pathinfo($entry, PATHINFO_EXTENSION), $exts)) :
+        if (array_key_exists(pathinfo($entry, PATHINFO_EXTENSION), $exts) && !preg_match('/^\./', $entry)) :
             $p = pathinfo($entry);
             $filename = $p['filename'];
             $fileimg_path = escapeshellarg('./tmp/' . $filename . '.jpg');