Use Ansible instead of a shell script to deploy the site from Jenkins.

Use it to manage the deployment and configuration of the node.js backend (#375) as well. Retargeted from #378.
Would it be alright to show the nova commands to do this automatically?

```
for region in DFW IAD SYD HKG ORD; do OS_REGION_NAME=$region nova keypair-add --pub-key ~/.ssh/drg.pub drg; done
```