/**
  * Update the specified resource in storage.
  *
  * @param  Request  $request
  * @param  int  $id
  * @return Response
  */
 public function update(CharacteristicRequest $request, $id)
 {
     //
     $characteristic = Characteristic::findOrFail($id);
     $characteristic->update($request->all());
     return redirect('product/characteristics');
 }