gravatar: Update for key ID registration mem handling

https://bugzilla.gnome.org/show_bug.cgi?id=740942
thetvdb: Update for key ID registration mem handling

https://bugzilla.gnome.org/show_bug.cgi?id=740942
tmdb: Update for key ID registration mem handling

https://bugzilla.gnome.org/show_bug.cgi?id=740942