Merge pull request #14 from Kjven/michael

merge request #15, implemented UseGPS activity
added some color, custom colors can be set in colors.xml
Merge pull request #15 from Kjven/calvin

merge request #15: added some color, custom colors can be set in colors.xml
fixed the up button in the action bar
changed button press colour and up action bar
Merge pull request #16 from Kjven/calvin

merge request #16
fixed gps crash