update build script to use npm deps
update build script to use npm deps

tomalec/polyup,googlearchive/polyup,tomalec/polyup,tomalec/polyup,PolymerLabs/polyup,wienczny/polyup,PolymerLabs/polyup,davidmaxwaterman/polyup,PolymerLabs/polyup,wienczny/polyup,googlearchive/polyup,davidmaxwaterman/polyup,davidmaxwaterman/polyup,googlearchive/polyup,wienczny/polyup