Preliminary implementation of VehicleListFragment in order to show the
status list of the vehicles. All ok with the new frgament and the how
the list is shown but problems arise with the GoogleMapFragment and have
to be solved.
1.Solved the problem with the GoogleMapImageButtonsLayer. Now, the exta
layer is underneath the NavigationsDriver Layer. The wrapper class is on
top of the original view and the imgButtonsView. As a result the
BroadcastReceiver was permanenly deleted because it was useless.
2.The replacement of fragments is happening normal(liitle more testing
is rewuired).
3.Minor Refactoring, mainly on the GoogleMapFragment