roster-window: use EmpathyRosterView
roster-window: use EmpathyRosterView

Lot of features have been disabled/commented out. I'll re-introduce them
progressively.

https://bugzilla.gnome.org/show_bug.cgi?id=677948

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