protected function replaceAppClass($start_php)
    {
        $contents = file_get_contents($start_php);

        $modified = str_replace(
            'Illuminate\Foundation\Application',
            'Shpasser\GaeSupport\Foundation\Application',
            $contents);

        if ($modified === $contents)
        {
            return;
        }

        $this->createBackupFile($start_php);

        file_put_contents($start_php, $modified);

        $this->myCommand->info('Replaced the application class in "start.php".');
    }