Fix pip: error: no such option: -V

pip version 1.1 in Python 2.6 does not support -V option to show its
version.
Fix cannot install ipython

Set the minimum working ipython version that will works with Python 2.6.
Add Python 3.2 support

Create virtualenv using Python 3.2. We're now supporting 3.2/3.3/3.4.