Added virtual environment enforcing for pip for the osx installation tutorial
Give credits to people in the sidebar to the left
update intro section: add Pro Python link
remote duplicate Chef in admin.rst
add link to Numba
update untangle link
update Ubuntu Python packaging docs link
expand "-" belongs to "Ansible"
Merge pull request #367 from cli248/update

Several modifications
"where ever" => "wherever"
Cython example added for strong typing
indentation fixed
minor changes (indentation fixed)
Cython: additional benchmark for standard CPU
misspelling in description
Included tldrlegal.com

tl;drLegal is a great place to look up what a particular license is all about. The website can be found here: https://tldrlegal.com/
Added oxford comma.
Merge pull request #371 from JonasGroeger/master

Included tldrlegal.com
Update cli.rst

Added Cliff module description.
Update cli.rst

Blank line added after the title Cliff.