fixed error in event_songs websocket
corrected bug in event songs
added database and notification client for tests
added test data and tests for event songs
correct tests
fixed error in event_songs websocket
corrected bug in event songs
added database and notification client for tests
added test data and tests for event songs
correct tests
Merge branch 'bugfix/websocket_example' of github.com:songster-project/songster into bugfix/websocket_example
reverse changes to playlist test data
only register to event songs if event hasn't ended
create new events now during the test
corrected test naming removed system tests
close events if they are not needed anymore
removed not needed end events
remove closed client connections
Merge branch 'bugfix/websocket_example' into feature/voting_v3

Conflicts:
	websockets/event_songs.js
added missing return statement and corrected comparison