Unify setup.py with my default template

This makes packaging fixes far easier to share.
Restrict Jinja to <2.6 for Python 3.2 installs

Jinja 2.7 is not compatible with Python 3.1 or 3.2, so we have to make the
dependencies really messy to workaround that.
Drop inclusive loading from colour requirements file

It will cause conflicts with builds using the colour extras.
Set the 'stable' PyPI classifier
0.13.1 released