Made overriding of the (Base)Message Entity possible.
Removed id field from Message mapping.
Changed default value for class.message setting.
Added skeleton entity for easy extending. :star2:
Fixed queues key in advanced_configuration.rst

The queues settings were under rabbitmq, but should have been under sonata_notification.
Updated changelog and readme for #59.
Update composer.json
Merge pull request #60 from pezia/patch-1

Fixed queues key in advanced_configuration.rst
Remove useless alias
Merge pull request #59 from Lexance/master

Made SonataNotificationBundle extendable for SonataEasyExtendsBundle.
Add missing indexes
Fix composer dependencies
Queued doctrine
SPBP-3 - notifs suite