style: use monospace for 'formatted-fixed' class The 'formatted-fixed' class is applied to PR comments, PR descriptions and repository descriptions. It already preserves whitespace via 'whitespace: pre-wrap', but the font is not monospace. As a result, diagrams or other ASCII art do not display well. Use monospace on this class to fix that.

[tox]
minversion = 1.8
envlist = py{26,27}-pytest

[testenv]
setenv =
    PYTHONHASHSEED = 0
deps =
    -r{toxinidir}/dev_requirements.txt
    py26-pytest: unittest2
    python-ldap
    python-pam
commands =
    pytest: py.test {posargs}