public function destroy($id)
 {
     SuratTugas::find($id)->delete();
     STActivity::where('st_id', '=', $id)->delete();
     STBantek::where('st_id', '=', $id)->delete();
     Session::flash('success', 'Data telah dihapus.');
     return Redirect::to('/admin/surattugas');
 }