Refactoring.

Moved the header of each site to a variable in base["title"].

If no title is present then the template will skip it and assume that
the subtemplate has a header. E.g faq.html
Changed the way the submenu works.

This moves the page specific submenu to a new place in the
title h2-tag. The new variable is called `subnav` for sub-navigation.
Merge pull request #90 from Prillan/menu

Menu changes