Add ORM EntityListener equivalent

[webdevilopers]

Original discussion started here: https://twitter.com/webdevilopers/status/724872011638562816 @jmikola

Created Feature Request as suggested by @malarzm .

ORM implementation: http://doctrine-orm.readthedocs.io/projects/doctrine-orm/en/latest/reference/events.html#entity-listeners

Domain-Driven Design use cases also discussed here: https://github.com/webdevilopers/php-ddd/issues/2

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