Addition of Google Maps friendly coordinates

Added a latitudeDegrees, which calculates the GPS position into only
degrees, which Google Maps uses.
Fix warning about reaching end of non-void function.
Fix warning about deprecated cast from string to char *.
Merge pull request #34 from plattrap/master

Compiler warnings
Merge branch 'master' of https://github.com/Jcps/Adafruit-GPS-Library into Jcps-master
Update parsing example to show new long/lat degrees values.
Merge branch 'Jcps-master'