[TIMOB-1420] reverseGeocoder returns postalCode instead of zipcode on Android

On Android zipcode property is returned as postalCode.

Eample workaround for now:

                    Titanium.Geolocation.reverseGeocoder(response.results[0].geometry.location.lat, response.results[0].geometry.location.lng, function(evt) {
                        var places = evt.places;
                        if (places != undefined && places.length > 0) {
                            //for android check if zipcode is undefined
                            if (places[0].zipcode == undefined)
                                Titanium.App.Properties.setString('ZipCode', places[0].postalCode);
                            else
                                Titanium.App.Properties.setString('ZipCode', places[0].zipcode);
                        }
                        if (oncomplete != undefined) {
                            oncomplete(response.results[0].geometry.location.lat, response.results[0].geometry.location.lng);
                        }
                    });