editor: fix generating interface name for new bridge connections (rh #1090575)

https://bugzilla.redhat.com/show_bug.cgi?id=1090575
wwan: make sure MM1 object signals are disconnected (rh #1083727)

Otherwise if something else holds a reference to info->mm_modem, we
could end up triggering signal handlers after we've disposed of
'info'.
mobile-wizard: advance from Country page when Enter is pressed (bgo #663774) (lp:981472)

Patch by Tiago Porangaba

https://bugzilla.gnome.org/show_bug.cgi?id=663774