Added StatHat reporting on webhook events received and published

Added basic StatHat counting for each webhook event received and published. Also logs a couple errors that could happen along the way - ie: invalid GET key or missing `type` POST data.

@DeeZone Seeing as how I'm probably gonna be adding StatHat tracking into other consumers and producers, do you think I should create a separate and simple DS StatHat library to handle packaging up and reporting data to StatHat?

Closes #7