Move tests after the rendered

[Chris Warburton]

Running tests standalone on the whole site is slow. Lots of the tests
are per-page anyway, like no-blogspot, no-gitorious, etc. Those can be
done once, after a page has rendered, so that subsequent pages don't
need to retest the whole site.

I think these make sense in separate derivations to the actual rendered
page, so pages don't need to be rerendered if we add/change tests.