Initial support for posting results to StatsD

1. Adding a fully configurable statsd module to allow publishing results to a dedicated server for visualization of trends.
2. Embeding Domnikl/Statsd in the lib directory for the statsd protocol publishing phase.
3. This is a feature that seems to be used/request allot for webpagatest like done in [WptScript](https://github.com/etsy/wpt-script).


Many thanks for making this project !