[Catalyst] configurable base url?

[Carl Johnstone]

> So if I want to run multiple versions of the same app it looks like I'll 
> have to do it on Apache with cgi/fcgi because mod-perl won't let you have 
> competing stuff in the same namespace.

We run 17 versions of the same app for 17 different sites on different 
domains.

The only thing we do do is poke into:

$c->apache->server->server_hostname

To get the servername (as in the apache config) for the site so that we can 
filter content and change logos appropiately.

Carl