roster: compare elements as utf8 strings, for correct collation
roster: compare elements as utf8 strings, for correct collation

https://bugzilla.gnome.org/show_bug.cgi?id=703453

GNOME/telepathy-account-widgets,Distrotech/telepathy-account-widgets,GNOME/telepathy-account-widgets,GNOME/telepathy-account-widgets,Distrotech/telepathy-account-widgets