Allow Purl to correctly parse no schema urls: https://github.com/jwage/purl/issues/20

This prevents a triple slash if you pass in `blahblah.com` which will think that `blahblah.com` is the path and not the host.
Merge pull request #1 from Polycademy/patch-1

Allow Purl to correctly parse no schema urls: https://github.com/jwage/p...