routing: Fix breakages with routing on some versions of Python. Finally figured what happened with change 6baa94da8b16 (this is a Mercurial hash by the way if you're looking at the Git mirror). Between Python 3.6 and 3.7 there was a change where the percent sign ('%') went from being escaped by `re.escape` to _not_ being escaped. So now we need to use different regex patterns dependin on the Python version, yay.

environment:
    matrix:
        - PYTHON: "C:\\Python34"
        - PYTHON: "C:\\Python34-x64"
        - PYTHON: "C:\\Python35"
        - PYTHON: "C:\\Python35-x64"

install:
    - "SET PATH=%PYTHON%;%PYTHON%\\Scripts;%PATH%"
    - "pip install -r requirements.txt"
    - "pip install -r dev-requirements.txt"

build: off

test_script:
  - "py.test"