Librato actor

Addresses #41.
Still needs integration tests.
Since these tests really write out to someones Librato account, lets make the metric names, descriptions and titles more interesting. I'd dynamically set the title/description to something really useful like:

title: Kingpin Integration Testing (v<VERSION>)
description: Executing tests at <INSERT TIME>

Also, set the metric name to something like `kingpin-integration-testing` (take a peek at the other integration tests and make the metric name look like the other names we've used)