add file filter to utility for determining whether new files exist, which triggers graph build
add file filter to utility for determining whether new files exist, which triggers graph build

LACMTA/loader,OpenTransitTools/deploy,OpenTransitTools/loader,LACMTA/loader,LACMTA/loader,OpenTransitTools/loader,OpenTransitTools/loader,OpenTransitTools/loader,LACMTA/loader,OpenTransitTools/deploy,LACMTA/loader,OpenTransitTools/loader