PyHAML integration.
Use the exposed API to load markdown extensions.
Clean up Mako preprocessor selection by filename.
Remove MultiMap from Request.

Using what Werkzeug provides as much as possible.
Form fields have a class with their name.
`versioned_static` for forcing static pages.
Use (signed) werkzeug cookies.
Removed uri package.

Tracker is broken.
Fix cookies/tracker.
Remove nitrogen.api.
Remove markdown and serve modules.
Fix tracker cookie setting bug.
Remove old route modules.
2.6 compatibility.
Remove import of redirect; we have explicit exceptions.
Remove compiled templates from examples.
Remove old dependencies.
WIP: bringing examples up to speed.

Many controllers currently broken.
WIP: move examples to example.
WIP: rebuilding example.