add a redirect example

[thisisjofrank]

Closes #395

[philhawksworth]

I'm not totally convinced this is the best way to do this.

It will indeed redirect any traffic to whatever URL this is served on to www.example.com, but is that desirable? A more desirable pattern would be for some wildcard matching so that we don't just send every request to the home page on a new domain.

so... example.com* -> www.example.com*

I think we should expand this example to work for all urls on the domain and to detect if the www subdomain is omitted.