Python update for round 7

This PR adds Python 3.

`~/FrameworkBenchmarks/installs/py2/bin/python` is Python 2.7.5
`~/FrameworkBenchmarks/installs/py3/bin/python` is Python 3.3.2
`~/FrameworkBenchmarks/installs/pypy/bin/python` is PyPy 2.0.2