overwrite ACRE_HOST_BASE when deploying on appengine
overwrite ACRE_HOST_BASE when deploying on appengine
googlearchive/acre,freebase/acre,googlearchive/acre,googlearchive/acre,freebase/acre,googlearchive/acre,googlearchive/acre,freebase/acre,googlearchive/acre,freebase/acre,freebase/acre,freebase/acre