Expose statsd

[cursiv3]

Moved statsd client init and statsd import to root index.js and added statsd to export object in the same file. The statsd client is available anywhere by require(monument).statsd

However, I could not figure out a way to test, and though the client is showing I am uncertain if it will fire data to an actual statsd server.

This PR relates to this issue: https://github.com/ansble/monument/issues/529