Patternfly css missing

[emrul]

I just tried to install this and I received a 404 error trying to retrieve /cockpit/@localhost/base1/patternfly.css

I think that this CSS has been removed from cockpit https://lists.fedorahosted.org/archives/list/cockpit-devel@lists.fedorahosted.org/thread/2Q6AAQXGI5IE5D7XMTJUIKP3NIS3CIBL/

I'd love to work on a PR for this but am totally swamped atm so at least reporting it here.

[mrevjd]

Please see #14 as a fix has been included.