Disallow installing on older versions of Python.

Review Request #3695 — Created Dec. 25, 2012 and submitted — Latest diff uploaded

Information

Review Board
release-1.7.x

Reviewers

Disallow installing on older versions of Python.

setup.py now checks if the version of Python on the system is new enough
for running Review Board. This should prevent the issue of someone
trying to upgrade or install on Python 2.4, getting the source tarball,
and then failing with confusing errors.
Tried to install with Python 2.4 and saw the error. Tried with 2.5 and
didn't.