/**
  * Delete a campaign
  *
  * @param integer $id
  * @return Redirect
  */
 public function destroy($id)
 {
     if ($this->campaign->delete($id)) {
         return redirect('campaign')->with('message', 'Successfully deleted.');
     }
     return redirect('campaign/' . $id)->withInput()->with('message_error', 'Error while deleting campaign. Please try again.');
 }