D-Bus thumbnailing service (additional plugins)

 Tumbler is a D-Bus service for applications to request thumbnails for various
 URI schemes and MIME types. It is an implementation of the thumbnail management
 D-Bus specification described on http://live.gnome.org/ThumbnailerSpec.
 .
 This package adds the following plugins to tumbler:
  - Cover thumbnailer for movies
  - FFMpeg/Libav thumbnailer for video files
  - OpenDocument Format thumbnailer
  - Raw Digital Camera Images thumbnailer.