webserver: somewhat parse passed host before using
webserver: somewhat parse passed host before using

This uses standard urlparse package to attempt to parse a url scheme before falling back to the raw string passed.

Close Issue #16
mozilla-services/Heartbleed,FiloSottile/Heartbleed,behzad88/Heartbleed,behzad88/Heartbleed,saisai/Heartbleed,FiloSottile/Heartbleed,FiloSottile/Heartbleed,behzad88/Heartbleed,saisai/Heartbleed,saisai/Heartbleed,mozilla-services/Heartbleed