Bump gupnp-av and gupnp-vala dep

["Zeeshan Ali (Khattak)" <zeenix gmail com>]

Hi everyone,
   I hope nobody minds if I bump minimum gupnp-av and gupnp-vala dep
to 0.7.0 (for rygel)? This is an unreleased version but I'll not
commit the sin of depending on unreleased external library so don't
worry about that. :)

-- 
Regards,

Zeeshan Ali (Khattak)
FSF member#5124