Add an xmlRelativeFile function for rendering a relative XML template.
Super-basic RSS feed that's just an empty <channel/>.
Move the route renderer into Renderer.hs. Not sure why it wasn't there before.
Rename page/postRouter to routePost/Page.
Title, link, and description in feed.
Show post title, GUID, and link in feed.
Show post bodies as well.
Only show RSS posts that should actually be visible (non-draft, non-queue).
Remove unused Data.Monoid import in Handler.
Change withL to withG and use a Getter instead of a Getting.

Getting changed in 3.9, and I'd like to maybe use that someday
instead. If I ever need a real lens and not a getter, I'll consider
changing it.
Set up a self link. (It's invalid since we don't know the approot!)
Load an app-root variable in the configuration yaml.
Render all URLs as absolute, including ones in the RSS.
Correct the RSS <link> in the template.
Re-add the RSS icon.
Merge branch 'rss' (closes #7)