Better error handling

[karussell]

Instead of just "bad request" the client should print the detailed message

Current workaround something like:

System.out.println(exception.getResponseBody().toString());

[boldtrn]

This is for the swagger generated client, isn't it?

[karussell]

Yes, currently just the geocoding ... related/duplicate issue: https://github.com/graphhopper/directions-api-clients-route-optimization/issues/6