Remove message from InvalidCommandException.
Move command handling into bundle. Move Pipeline et alii into own NS.
Id stores $value.
Enforce Identity::create() factory method.
Rename IdentityId to NameId.
Move Identity aggregate root to Surfnet\Stepup namespace.
Create pipeline ProcessingAbortedException with generic #getErrors().
Create handy InvalidArgumentException factory method.
Add service definition file dedicated to command handlers.