Update README.md
Merge branch 'master' of git://github.com/openaddresses/openaddresses-conform into xml
nonworking xml branch
don't instantiate progress bar if no content-length header available
change source.id to source._id and scrub all _* params before saving source.

Conflicts:
	index.js
use data property, not cache, to find file

Conflicts:
	index.js
working(?) XML support