Use newest version of PostgreSQL JDBC bindings
Add HSL DataImporter
added SensorEventStream class.
Merge remote-tracking branch 'origin/sensorEventStream' into sensorEventStream
Implemented Feature Stream
Merge remote-tracking branch 'origin/sensorEventStream' into sensorEventStream
Added LimitedQueue Implementation

Conflicts:
	backend/src/test/java/eu/liveandgov/wp1/backend/WindowStreamTest.java