add edx-west/.gitignore for symlink to config repo

Not checking those symlinks in since they are symlinks to another repo,
but generally people will want these.  On my machine they look like
this:
    configuration-secure@ -> ../../../configuration-secure
    edx-secret@ -> ../../../configuration-secure

Just for the edx-west configuration files.

Rename edx-platform version variables

edx-west/{prod,stage}-jumpbox: barebones playbooks

Feanil/vpc tools

Remove references to cms update_templates

Just to facilitate user updates to the jumpboxes.

vagrant provisioning updates

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

Jbau/cme and carnegie

Committer: jbau <jbau@stanford.edu>

 edx-west file cleanup

Handle cases where we need to refresh ruby-build due to new ruby version

initial working version, tested on ubuntu.

remove mongo server from requirements

Add more control over rabbit and worker instance types.

Be able to generate ssh config rules given a cloudformation stack name.

Feanil/provision vpc

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.