Quick patch: Force matplotlib version to be less than 1.5
Quick patch: Force matplotlib version to be less than 1.5

Our testing system uses python 2.6 still, but the latest version of matplotlib
no longer supports that version of python.

We need to get later python support and update our testing system, but for now,
make sure we work in testing.

chapel-lang/pychapel,russel/pychapel,russel/pychapel,russel/pychapel,chapel-lang/pychapel,chapel-lang/pychapel