Cherry-picked urb.js additions from test
Cherry-picked urb.js additions from test

urbit/urbit,urbit/urbit,jfranklin9000/urbit,urbit/urbit,ngzax/urbit,ngzax/urbit,ngzax/urbit,urbit/urbit,jfranklin9000/urbit,ngzax/urbit,jfranklin9000/urbit,belisarius222/arvo,urbit/urbit,ngzax/urbit,cgyarvin/arvo,joemfb/arvo,ohAitch/arvo,ohAitch/arvo,cgyarvin/arvo,urbit/urbit,urbit/urbit,jfranklin9000/urbit,eglaysher/arvo,belisarius222/arvo,ngzax/urbit,Fang-/arvo,jfranklin9000/urbit,joemfb/arvo,ngzax/urbit,jfranklin9000/urbit,solri/arvo,jfranklin9000/urbit