The creator name is only visible to the creating user itself.

Variable für Schwellwert zur richtigen Beantwortung einer Planquadratfrage im Backend implementiert.

CouchDBDao und Question-Entity um neue Attribute fuer Toggle Anzahl Markierungen aufheben erweitert.

Conflicts:
	src/main/java/de/thm/arsnova/dao/CouchDBDao.java

These checks will be done by service and security implementation if needed

This affects:
* Some null checks before instanceof checks
* CouchDBDao.collectUnansweredQuestionIds()
* DeprecatedApiInterceptorHandler.getDeprecatedApiAnnotation()
* CacheControlInterceptorHandler.getCacheControlAnnotation()
* CacheControlInterceptorHandler.setCacheControlResponseHeader()
* FeedbackService - userService private field

SessionController: Append integer to a string will result in a string
ApplicationPermissionEvaluator: Code formatting
UserService: Create new user object instead of assining parameter reference
ARSnovaSocketIOServer: No exceptions are thrown

No one will find it in method convertFileToByteArray.

The removed implementation used events wich were never published in any
part of the application.