change to chmod as privileged user.
Changes to make the forums run using unicorn and
unix sockets.
fix permissions.
Test changes.
Refactoring to put es and rabbitmq on one host.
WIP, syntax good, testing in progress.
Merge pull request #722 from edx/e0d/idempotent-chmod

change to chmod as privileged user.
Merge pull request #741 from edx/e0d/commoncluster

E0d/commoncluster
bug fixes relate to re-location to /edx
Add a new arg just for git refs.

This seperates the git refs from the rest of the vars because the git refs should end up in
the ami document in mongo but the other vars should not.
Add an env tag to studio and edxapp dns names.
Allow studio access for urls with env prefixes.
Run migrations before syncing the DB.
Begin referencing environment and deployment instead of env_type and env_name.
Have only one YAML message header.
Merge pull request #745 from edx/feanil/proper_extra_vars

Feanil/proper extra vars
adds new migration vars.
fixing extra notifies
syntax
fixing bad merge conflict