Disable geocoeder input if addWaypoints is false.
Disable geocoeder input if addWaypoints is false.

Close #133.

martinboehm/leaflet-routing-machine,ngonzalez/leaflet-routing-machine,wbg/leaflet-routing-machine,martinboehm/leaflet-routing-machine,ngonzalez/leaflet-routing-machine,rossanag/leaflet-routing-machine,martinboehm/leaflet-routing-machine,rossanag/leaflet-routing-machine,wbg/leaflet-routing-machine,AW-UC/leaflet-routing-machine,AW-UC/leaflet-routing-machine,wbg/leaflet-routing-machine,rossanag/leaflet-routing-machine,ngonzalez/leaflet-routing-machine,AW-UC/leaflet-routing-machine