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.

Update main.yml to fix a typo.

adding iam role association to launch configurations

Adding matching tags for key length fix.

fix typo.

Fix typo in FEEDBACK_SUBMISSION_EMAIL setting name

Script for creating new jenkins server

Staging setup for stanford

Update fullstack memory.