[WIP] Ansible based site deploys

This is a work in-progress to deploy sites with Ansible instead of Capistrano through Bedrock itself. The main benefits are:

1. Removes Ruby requirements
2. Ansible can run the deploy itself easily
3. Re-using hosts/settings from Ansible configs

It requires more work to separate the different workflows for dev and staging/production. And since there can be multiple WP sites on a server, we need a way to target ones for a deploy.