public function store(Request $request)
    {
        $this->validate($request, [
            'title' => 'required|max:255',
            'type'  => 'required|max:255|alpha|unique:navigation,type',
        ]);

        $navigation = new Navigation;
        $navigation->fill($request->all());
        $navigation->published = $request->get('published', false);
        $navigation->save();
        flash()->success(trans('cms::navigation.store.success'));

        return redirect()->route('administrator.navigation.index');
    }