use python2 instead of python

[haileys]

I run Arch Linux in production, which uses Python 3 for its /usr/bin/python.

mentos.py should explicitly state that it wants Python 2.

[veprbl]

+1

[tnm]

This will break on older distros, like an old Debian. I'm going to close in favor of us adding support for Python 3 itself, which will obviate this entire issue.

[haileys]

In the meantime, is it possible to detect the right Python executable to use from Ruby, and then run mentos.py through that?

I'm using my fork of pygments.rb on my sites, but I'd like to start using mainline again.