don't include %mime by default, base64 when you do
don't include %mime by default, base64 when you do

so that it doesn't break the page via stray </script> tags

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