Added supportability in the method isLocationEnabled(Context) for
earlier android SDK's.
Correct some comments. Put method
checkLocationServicesAndPromtForAction() on Resume(). Now the app checks
if location services are enabled during runtime and promts an alert
dialog if needded.
Comments. Add onDestroy() to the MapFragment to release the Map API.
Add some atributes on the method initializeGoogleMaps(). Add comments.