[Catalyst] regexes and auto actions

[Carl Johnstone]

> Use a controller base class that implements the story/comments actions, 
> and just set the relevant section (i.e. news, sport, football) in an auto 
> or a begin action.

We've already got an auto in the base class to do that, we can then generate 
navigation, breadcrumbs etc. However we have specific bits of code to run 
too, so we'd end up with a list of conditionals in there.

Carl