Nitrous setup integration

This pull request add a `nitrous` directory to the root of the repo. This directory contains some demo data and a setup script to make creating an OpenMRS ID instance on Nitrous.IO easy.

[![Hack on Nitrous](https://d3o0mnbgv6k92a.cloudfront.net/assets/hack-s-v1-0616054bfad452919522f1d08ad1fddf.png)](https://www.nitrous.io/hack_button?source=embed&runtime=rails&repo=elliottwilliams%2Fopenmrs-contrib-id&file_to_open=nitrous%2Fquickstart.md)