Adds lat/lon type position rather than zip code

Inspection of several searches demonstrated that the journies where frequently
failing or finding off correlations of long journeys in some countries. This is
due to the similarity of postal codes in different countries. This is improves
by now using the unique lat/lon position associated with the postcode.
Merge branch 'master' of https://github.com/ga7g08/GoogleMapsAPI_experiment