youtube-dl: Updated to version 2013.09.10

Changes since last version:

  $ git algd 2013.09.07..2013.09.10
  * a1ab553 - release 2013.09.10
  * 07463ea - Add an extractor for Slideshare (closes #1400)
  * 6d2d21f - [sohu] add support for my.tv.sohu.com urls (fixes #1398)
  * 061b288 - Fix the minutes part in FileDownloader.format_seconds (fixed #1397)
  * 8963d9c - [youtube] Modify the regex to match ids of length 11 (fixes #1396)
  * 890f62e - Revert "[youtube] Fix detection of tags from HLS videos."

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