Laravel custom interface placement

I am making a blog with laravel and here, users can subscribe for newsletters. The thing is I am planning to use mailchimp and I need to make all the necessary interfaces, classes and service providers. After watching laracasts take on this, they put all the files in app\Acme\Newsletters and app\Acme\Notify. But that was in Laravel 4. Now there are separate folders for providers. So should place interfaces and classes in app\Blog\Newsletters and service providers in their dedicated folder, or all in one? And since in the autoload there is already a psr-4 directory defined

psr-4 : {"App\\" : "app/"}

I do not need to edit the autoload, since the Blog directory is inside the app/?

via Chebli Mohamed