[RFC] Domain managers

As many time mentioned (not only me) principale of creating things is not job for repositories, theirs job is finding. So I finally find some time to introduce "proper" managers to do the job right.
http://www.php-fig.org/psr/psr-2/

`There MUST NOT be a hard limit on line length; the soft limit MUST be 120 characters; lines SHOULD be 80 characters or less.` its allowed but recommended to not exceed 120 characters.