This is no longer needed since the "released for" per question setting
has been removed.

Fixes memory leak in netty-socketio.

* Organize imports
* Add missing Override annotations
* Remove trailing whitespace

Do not check for active user count. Check response content type.

The context:property-placeholder config element does not work as
intended. See https://jira.spring.io/browse/SPR-9989.

Paul-Christian Volkmer authored 10 years ago and Daniel Gerhardt committed 10 years ago

Set default evaluation result to false and throw an AccessDeniedException.
SecurityExceptionControllerAdvice checks if there is an valid login and
decides whether to send HTTP 401 or HTTP 403.

Conflicts:
	src/test/java/de/thm/arsnova/controller/AbstractControllerTest.java