rake gather_assets replaces collectstatic
so all references and logic to handle both
are removed

removes collect_static.yml since now there are
only two tasks for rake gather_assets.

These are some minimal changes to support 1.3, does not yet include role
dependencies.

The previous one did not work so updating it with a copy from production.

If the nginx play is called with the nginx_conf varialble, then expect
to find in {{secure_dir}}/files/nginx.conf and copy it over.  If not set
then the default one already there will be sufficient.

One comes with the standard installation, overwrite with our own,
provided in {{secure_dir}}/files.

To support variations on our local LMS sites files it is helpful to have
subdirectories where we can store variations.  At Stanford I'm using
this so I can store carnegie/lms.j2, a variation on our normal lms.j2.

To use you can call the role like this:
    - {'role': 'edxapp', 'openid_workaround': true, 'template_subdir': 'carnegie'}
This would be from your main playbook file, in my case
edx-west/carnegie-prod-app.yml.

While in here I noticed we weren't setting owner or perms on the
sites-available/XX files, fix that.

* updates vagrant files for Vagrant 1.3.1 compatibility
* attempts to fix race condition where rabbitmq guest user addition was
  failing

The mysql_db command from ansible expects to be able to connect to the
`mysql` DB, which prevents changing the MySQL DB for xqueue to a
DB on which we don't have overall administrator privileges.

https://github.com/ansible/ansible/blob/devel/library/database/mysql_db

This is necessary to be able to get several services using the
`/opt/wwc/env.json` & `/opt/wwc/auth.json` files. The configuration
files would get overwitten when this is used by several different
services cohabiting on a single instance

Since xqueue has its own set of dependencies, using a dedicated
virtualenv allows to avoid potential dependencies conflicts when
several services are installed on the same instance.

To be used in conjonction with
https://github.com/antoviaque/xqueue/commit/303601ea9ffcbd30f6bb3e2b9a42d6f85fbcf6b3

This is necessary to be able to get several services using the
`/opt/wwc/env.json` & `/opt/wwc/auth.json` files. The configuration
files would get overwitten when this is used by several different
services cohabiting on a single instance

In certain states, ruby is installed but the env is not setup so it is importart
to always run the environment update task and the rehash task.

The rbenv install task prompts if the version of ruby is already installed. This
freezes the build so skip it if the version directory already exists.

Also add two more useful plugins.

fix typo.