LDAP login now returns status codes 200/401 instead of using
redirection.

Note that this is currently untested. :o

Introduced a new CouchDB view method, and a new field to divide
'skill_questions' into preparation, lecture, and flashcard
variants. The former question type 'flashcard' will be removed
soon.

It is required to setup those values after login. Current session
information will be set up after joining a session.

These URIs should not be requested if user does not successfully join a
ARSnova session.

If user is successfully logged in, store authentication in security context
else redirect to login page.

There is no request parameter name set, so forwarding will fail. Fixed
by this patch.

This could be used to send data via websockets without searching
sessionIDs or user tables within ARSnova.

Simply publish an event with ARSnova-sessionKey from within the
application.

This sets current user and ARSnova session information in a session
scoped service bean. If the user connects with a websocket, the
websocket session ID will be set in addition to the user and session
object.

The aspects methods pointcut after returning from joinSession() method
in SessionService. So the UserSessionService will be set with all needed
data after a user successfully joins a session.

With this service available, it can be used to replace some usage of
Array/Map based application wide data structures that cause some trouble
when stopping or redeploying the application.

This bean will now be linked to a session returning different values for
different sessions and users.
It can be used to access current users (ARSnova)-session and user object.

This bean holds user and session object of the current user after he
joins a session and could be used to access those objects within the
application.

Added two simple URIs to get a JSON representation of the referenced
objects.

Those logging entries are obsolete and only used to grow log files ;-)
Only log log entries if an error occured - not for each event.

It is possible now to simulate LDAP login by requesting login page manually
but it needs some more internal changes to do all needed stuff for a real
ARSnova login.