Revert "Merge branch 'jjardon/pip_improvements' into 'master'"

This breaks the installation for some systems (like debian stable) because a very old version of python-pip is installed, and then it doesn't get upgrade with "pip install -U pip", so the fs python package doesn't install correctly

Revert this will make the problem go away assuming the system doesn't have python-pip already installed through the package manager

This reverts merge request !288 (merged)