This fixes Socket.io not broadcasting and accepting feedback data.

/questionbylecturer/* => [/session/{sessionKey}]/lecturerquestion/*
/questionbyaudience/* => [/session/{sessionKey}]/audiencequestion/*

Clean up service tests and clean up logged in users. Added logged in users
if needed.

Conflicts:
	src/main/java/de/thm/arsnova/dao/CouchDBDao.java
	src/main/java/de/thm/arsnova/dao/IDatabaseDao.java
	src/main/java/de/thm/arsnova/services/SessionService.java
	src/test/java/de/thm/arsnova/dao/StubDatabaseDao.java

compatibility with third party frontends.

API changes:
- /session/visitedsessions => /session/?filter=visited
- /session/mysessions => /session/?filter=owned
Added changed routes to LegacyController.

The method now returns users visited sessions and all sessions connected to
a course the user is enlisted - if connector is activated.

If connector is enabled, user will see in addition to his visited sessions
all sessions linked to his courses.