Playlists fade-out bug for direct buffers fixed.

This commit closes issue #146 of MantisBT
(http://cordobazombie.com.ar/dev/tracker/view.php?id=146)

Still there are problems for streaming buffers,
and playlists faded out during silence won't pause as they should.
These bugs were reported as issues #147 and #202 in MantisBT.
Merge branch 'multimedia' of https://github.com/agudpp/CordobaZombie into multimedia