Fix NPE caused by missing ApplicationEventPublisher in AnswerRepository
The CouchDbAnswerRepository already used its own
ApplicationEventPublished and unintentionally overrode the
setApplicationEventPublisher of the abstract repository class. The
publisher was no longer used anyways, so it has been removed.
Furthermore, the ApplicationEventPublisher is now visible for child
classes.
Regression-MR: !359 (merged)
Regression-Commit: 68ddc8cb
Edited by Daniel Gerhardt