Ruby 2.2 upgrade in Demo environments

Update timeline

1. scheduled May 13, 2016, 08:54 AM UTC

   All demo environments will be upgraded to Ruby 2.2 in preparation for a production upgrade after DevCon.

2. in progress May 13, 2016, 09:04 AM UTC

   Change is merged, environments will pick up 2.2 on their next Puppet run. Nitro will require re-deployment to all environments once this maintenance is completed.

3. in progress May 13, 2016, 10:23 AM UTC

   Some servers are having trouble finding the package. Investigating.

4. in progress May 13, 2016, 10:52 AM UTC

   Apt repos were being managed badly by Puppet. That issue is fixed, and I'll give this some time to make its way out.

5. completed May 13, 2016, 12:19 PM UTC

   All environments appear to have been upgraded now.