Added MS_METADATA_KEY_ID to supported keys in youtube source, otheriwse MS_RESOLVE_FULL does not resolve it.
Added MS_METADATA_KEY_ID to supported keys in youtube source, otheriwse
MS_RESOLVE_FULL does not resolve it.

jasuarez/grilo-plugins,MathieuDuponchelle/grilo-plugins,vrutkovs/grilo-plugins,grilofw/grilo-plugins,MikePetullo/grilo-plugins,GNOME/grilo-plugins,GNOME/grilo-plugins,vrutkovs/grilo-plugins,grilofw/grilo-plugins,MikePetullo/grilo-plugins,MathieuDuponchelle/grilo-plugins,vrutkovs/grilo-plugins,kyoushuu/grilo-plugins,MathieuDuponchelle/grilo-plugins,kyoushuu/grilo-plugins,MikePetullo/grilo-plugins,vrutkovs/grilo-plugins,kyoushuu/grilo-plugins,jasuarez/grilo-plugins,MathieuDuponchelle/grilo-plugins