add a test play for testing rolling deploys

updating the commoncluster plays so that they can be run from jenkins

removing discern from cont integration

Add thin-backup plugin

Update to no longer track repo.txt

Gems for everyone.

Although this can be used as part of any DR strategy, the immediate intent is
providing an ability to quickly spin up Jenkins master instances for testing
against. (A user would run the ansible script to create a test instance,
then restore backup .zip which would contain all of the jobs' and master's
configuration.)

ThinBackup plugin doc: https://wiki.jenkins-ci.org/display/JENKINS/thinBackup

Update README.md

updating abbey to use a deployment.yml var file

Working role for review.

Set rbenv tar target to .rbenv instead of /home/jenkins/.rbenv

removing stub code

use ssh_opts

whitespace

whitespace

whitespace

ssh_opts

whitespace

whitespace

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