[WIP] Setting up a base new-relic setup using ansible vault

- Fixes #67 

This change also introduces a new `ansible-vault` secrets file, which has our encrypted `new-relic` key. A side-effect of this now you'll always need the vault key to deploy/setup.

Thoughts?
Minor: @gasi and I have found it helpful to keep package.json dependencies alphabetized. Otherwise as the list grows, it's easy to make mistakes, e.g. duplicating.