Fix typo in default 'from' email

Set default emails.

Remove MITX from the name of the features dict.

This is to correspond to the same fix in the edx platform.
https://github.com/edx/edx-platform/pull/1827

Without this, the defaults get set to '' and then sentences on the site look weird because the emails are missing.

add readme file for edx-west, prod-log playbook (into master)

using role dependencies for common/supervisor

adding vars_files for nginx

fixing nginx_sites for provisioning

While in here do a couple of cleanups:

- remove a log file
- add a simple playbook for refreshing roles on the prod log machine

adding option to enable basic auth when we provision

Make basic_auth a global nginx parameter

Instead of enabling basic auth per role this makes it
an nginx parameter which makes more sense for sandboxes
and probably other servers where we want basic auth turned on

removing basic auth credentials.

Feanil/stage

Also renaming the deploy_* plays to the play name

adding admin subnet

seed forums on import

New role for installing and configuring haproxy

Had an instance where datadog wasn't starting, added started task

This can be useful for managing rabbitmq clusters and possibly
as a replacement for ELB.

Added additional log format for use with client SSL certificates