Getting StatsD Backend to work with v2.0 endpoint

1. The major fix is adding the v2.0 aggregated metrics endpoint. 
2. Added index.js file - without it, we could not get this module to install in statsd
3. Added a sample configuration file, to get this module working
We probably do not want `localConfig.js` to ship ship with this. It would be ok to include in the README or in some other documentation.