Warn if activate or deactivate are not implemented
Warn if activate or deactivate are not implemented

https://bugzilla.gnome.org/show_bug.cgi?id=679508
Distrotech/libpeas,Distrotech/libpeas,chergert/libpeas,chergert/libpeas,GNOME/libpeas,gregier/libpeas,GNOME/libpeas,gregier/libpeas,Distrotech/libpeas,chergert/libpeas,gregier/libpeas,gregier/libpeas