[MPRIS] TrackChanged Signal

[Kevin Anthony]

I think it's useful for the player to emit a signal when the track is
changed. An example of this being useful is your querying the player's
metadata and displaying it on a LCD screen.  This prevents you from having
to query the metadata contently, you simply listen for the signal and when
you hear it, re-query the metadata.

Here is a patch.

-- 
Thanks
Kevin Anthony
www.NoSideRacing.com

Do you use Banshee?
Download the Community Extensions:
http://banshee.fm/download/extensions/
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