Freeze pip, setuptools, and virtualenv

Pip 8.0.0, released a few hours ago, tries to uninstall deb-installed
python modules that it wants to upgrade, and always fails when doing so.
The effect is that configuration/requirements.txt cannot be fulfilled,
notably ansible 1.9.3-edx, which requires an upgrade to pycrypto.

This forces the installation of pip to the latest one prior to 8.0.0,
7.1.2.

It also freezes setuptools and virtualenv, so that they should all match
the current versions required on
playbooks/roles/common_vars/defaults/main.yml:common_pip_pkgs.

Alter pdf invoice vars.

roll back upgrade to 1.5 while we wait for forums

add base configuration setting for commnuication with programs, organ…

This has started failing, experimenting.

700 doesn't seem to match what Jenkins does.

ECOM-3455

Check for file before altering

E0d/fix edxapp

Sandboxes for ecommerce don't pass along the scheme properly

Make include of generated make files silent

Added E-Commerce API URL to course-disovery Django settings

ECOM-2835

This commit properly sets the X-Forwarded-Proto header so Django knows when a request originated as HTTPS.

 ECOM-2835

The nginx config is only configured for prod (when it is behind an ELB
and has http_x_forwarded headers).  We want to pass along the NGINX
headers too (mainly scheme) whcih is what the LMS/CMS does on sandboxes.

Add more documentation on specifics of our docker usage

disable basic auth on course assets

Stop looking for docker in our production boxes

This quiets a bunch of logging like
error: Docker GET from 'http://localhost/info' failed

updated sandbox ami

use the elif instead of second if statement

added the nginx redirected logic

DEVOPS-3275 Add theme selector to Jenkins ansible-provision job