public function folder($id)
 {
     if (Auth::guest()) {
         return Redirect::to('/');
     }
     if (!Folder::isFolder($id)) {
         return abort(404);
     }
     $root = Folder::foldersStructure();
     $this->ViewTemplate['title'] .= ' - ' . Auth::user()->username;
     $this->ViewTemplate['root'] = $root;
     $this->ViewTemplate['folder_id'] = $id;
     $this->ViewTemplate['path'] = Folder::getSubLinks($id);
     $folderView = ['folder_id' => $this->ViewTemplate['folder_id']];
     return view('template', $this->ViewTemplate)->nest('content', 'content/folder', $folderView);
 }