Conflicts:
	playbooks/roles/common/tasks/edx_logging_base.yml
	playbooks/roles/common/tasks/main.yml

Jarv/cleanup lms and examples

Feature/jrbl/tagging update install

* update tasks are meant to be the fast ones and the ones we want to be
  sure to always do (directory creations, permissions, etc.)
* install tasks are all the really slow things, like the git repo clone
  and package installations
* Every task can by run by --tags=install,update - which is the same as
  having no tags at all.

Conflicts:

	playbooks/roles/lms/tasks/main.yml

Jbau upstart restart handler

Jbau/lms preview

Use the new mitx repo locale

Nginx log reconfiguration

cleaning up old group_vars files

Conflicts:
	playbooks/roles/common/tasks/main.yml

Documentation improvements, separation of phases, moving toward not usin...

* sends logs to /mnt/logs/nginx instead of /var/log. Note that on fresh
  server startup, nginx will still log to /var/log until it reads its
  configuration.
* Installs logrotate configuration for freshly moved nginx logs
* Some directory and file permissions fixups
* Improved order of operations on nginx installation/bringup

Configure logrotate to treat edx logs appropriately