/**
  * Store a newly created resource in storage.
  *
  * @return Response
  */
 public function postIndex(Request $request)
 {
     $usuario = new Usuario();
     $inputs = $request->all();
     $usuario->fill($inputs);
     if ($usuario->validate()) {
         $credentials = $request->only('email', 'password', 'first_name', 'last_name');
         $errores = $this->registrarPorSentry($credentials);
         if (empty($errores)) {
             return redirect('login')->withInput([$credentials['email']])->with('mensaje', 'Se registró el usuario correctamente');
         } else {
             return back()->withInput()->withErrors($errores);
         }
     } else {
         return back()->withInput()->withErrors($usuario->getErrors());
     }
 }