Updated to V13

Mikal Hart's v13 changes to the original TinyGPS
pushed into
Kevin Walton (kevin@unseen.org) and
Terry Baume (terry@bogaurd.net) ’s
$PUBX enabled version
Also added a new example ‘test_with_PUBX_gps_device’
to show how to configure ublox to disable NMEA sentences use $PUBX and
to poll the GPS for PUBX sentences.