Added conversion of timestamp for pre-Jellybean MR1 APIs addressing issue #31, now on the correct branch
Added required permissions to start a Wifi scan and to read scan results for issue #16
Added getter for Wifi Service
Included WifiHolder in sensor thread setup
Added method to serialize a list of scan results at a specific time for issue #16
Implementation of a Wifi Holder that periodically checks the list of available Wifi Access Points
Added constant for Wifi Holder delay
Merge branch 'feature/newSensors' of https://github.com/HeinrichHartmann/LiveGovWP1 into feature/newSensors
Merge branch 'dev' of https://github.com/HeinrichHartmann/LiveGovWP1 into feature/newSensors
Preparations for the Bluetooth sensor holder for issue #16
Preparations for the Bluetooth sensor holder
Preparations for the Bluetooth sensor holder
Preparations for the Bluetooth sensor holder
Merge branch 'feature/newSensors' into dev

Conflicts:
	mobile/SensorCollectorProject/SensorCollector/src/main/java/eu/liveandgov/sensorcollectorv3/sensors/sensor_producers/BluetoothHolder.java