Modify UbloxGPSSensorController class.

- Replace serialReadLine() method with getNmeaSentence(GPXXX) method.
- Add readSensorValues() method.
- Add fields for time, date and speed.
Merge branch 'features/gps-module' of https://github.com/DanGorst/project-latex into features/gps-module

Conflicts:
	project.latex.balloon/src/project/latex/balloon/sensor/UbloxGPSSensorController.java

Merge conflict resolved