Add support for python 2.6 in test code.
Update south to 0.8.1, only version available using pip.
Use more readable version level comparison
Pre-install numpy/scipy using pip instead of apt-get
Back to the original numpy/scipy method

Just realized the problem is later on in the process. This part was working fine other than the face that it install old numpy/scipy versions. I'm putting this back to the original state for now to avoid further cluttering the python 2.6 branch with test related commits.
Merge branch 'goodbye_numpy_scipy' into python_2.6
Merge pull request #92 from cbmi/python_2.6

Add support for Python 2.6 in test code