Clarify how default stub is used.
Clarify how default stub is used.

alexreisner/geocoder,tortuba/geocoder,davydovanton/geocoder,AndyDangerous/geocoder,guavapass/geocoder,mveer99/geocoder,sjaveed/geocoder,3mundi/geocoder,Devetzis/geocoder,jgrciv/geocoder,moofish32/geocoder,mdebo/geocoder,aceunreal/geocoder,FanaHOVA/geocoder,donbobka/geocoder,epyatopal/geocoder,brian-ewell/geocoder,eugenehp/ruby-geocoder,rios1993/geocoder,TrangPham/geocoder,rayzeller/geocoder,andreamazz/geocoder,boone/geocoder,ankane/geocoder,mehlah/geocoder,rdlugosz/geocoder,tiramizoo/geocoder