Added virtual environment enforcing for pip for the osx installation tutorial
Plac module

Added Plac module description
Switch from Chishop to pypiserver
update "env.rst"
add comma
Merge pull request #365 from cli248/update-envrst

update "env.rst"
Merge pull request #364 from schmichael/goodbye-chishop

Switch from Chishop to pypiserver
Merge pull request #362 from DhiaTN/patch-1

Plac module
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
Update make files with versions from Sphinx 1.2
Fix project name in generated files (osxpython -> pythonguide)
make.bat: Try Sphinx installed in Python when sphinx-build is not in PATH
Fix typo
expand "-" belongs to "Ansible"
Merge pull request #367 from cli248/update

Several modifications