3.4.4:
- Remove dependency on newer versions of glib
- Fix overescaping of URIs in XSPF playlists
- Add support for the itmss URI scheme
- Require gmime 2.6
- Fix small memory leak in totem_pl_parser_can_parse_from_data()
- Add read and write support for Totem XSPF extensions
  (starttime and playing attributes)
- Send content-type along with playlist-started/-ended signals
  for PLS, M3U and XSPF playlist types