Refactoring
Merge branch 'sensorEventStream' of github.com:HeinrichHartmann/LiveGovWP1 into sensorEventStream

Conflicts:
	backend/src/main/java/eu/liveandgov/wp1/backend/SensorValueObjects/AccFeatureValue.java
	backend/src/main/java/eu/liveandgov/wp1/backend/Stream/WindowStream.java
	backend/src/main/java/eu/liveandgov/wp1/backend/format/SampleWindow.java
	backend/src/test/java/eu/liveandgov/wp1/backend/WindowStreamTest.java