code: protected function registerCommands()
  	{
  	    $this->app['command.countries.migration'] = $this->app->share(function($app)
  	    {
  	        return new MigrationCommand($app);
  	    });
  
  	    $this->commands('command.countries.migration');
  	}
docs: Register the artisan commands.
  
  @return void