Fix setup.py and tests after addition of writers/html_base and mv of math.css.
treefb2a91035d368f6f6b51c38549d9a99dce4892e0
drwxr-xr-x - docutils
drwxr-xr-x - prest
drwxr-xr-x - sandbox
drwxr-xr-x - web