Change the GetlastknowLocation for the LocationSensor to use data not older than 5 min, and not in the future
Changed Location sensor data time from gps time to SNTP time
Merge branch 'fix_location_sensor_last_known' into unstable

Conflicts:
	src/nl/sense_os/service/location/LocationSensor.java
Merge branch 'unstable' into merge_demo_project

Conflicts:
	.classpath