internal: Try handling URLs in a consistent way. * Now URLs passed to, and returned from, routes will always be absolute URLs, i.e. URLs including the site root. * Validate the site root at config loading time to make sure it starts and ends with a slash. * Get rid of unused stuff. * Add tests.

language: python
python:
  - "3.4"
install: "pip install -r requirements.txt"
script: py.test