added directory processing functionality
added directory processing functionality

wboykinm/map-vectorizer,maxolasersquad/map-vectorizer,tlevine/map-vectorizer,NYPL/map-vectorizer,NYPL/map-vectorizer,nypl-spacetime/map-vectorizer,tlevine/map-vectorizer,wboykinm/map-vectorizer,maxolasersquad/map-vectorizer,nypl-spacetime/map-vectorizer