Merge pull request #32 from jhesketh/master

Revert "Install a later version of virtualenv"
Merge pull request #33 from jhesketh/master

Grab virtualenvwrapper from pip
Revert "Grab virtualenvwrapper from pip"

This reverts commit 3f7e8196fe952a5b55873391a73ea285119db5e1.
Horrible hack to get latest virtualenv