conradz/rework-assets — pull request #7 by bclinkinbeard (2014-06-04 01:44:52+00:00)
Title: If no valid path is found, return the original

I have no clue why, but Leaflet's styles include `url(#default#VML)`. I don't know if this sort of thing is widespread, but it seems like a good idea to leave stuff we don't recognize alone.