We currently renamed some route defininion options in #6738:

• pattern -> path
• hostname_pattern -> hostname

But IMO hostname is still not perfect because it should be simply host. Reasons:

1. It's also Request::getHost()
2. The term hostname has been obsoleted in http://tools.ietf.org/html/rfc3986#appendix-D.2 and uses the host only
3. hostname in the RFC was defined as the registered domain name, but we probably also want to match IP-Adresses with the pattern which is the host = IP-literal / IPv4address / reg-name for.