Merge pull request #2 from Edools/feature/create-listener

Feature/create an Event Listener
Merge pull request #3 from Edools/feature/rails-base-register-the-service

Feature/registering the service
Improve ActiveEvent::Configuration interface
merge
Merge pull request #4 from Edools/feature/improve_config_interface

Improve ActiveEvent::Configuration interface
added hook sync for the listener service and a LOT of refactoring