v3 - initial librato support!

[^^ monitoring latency on https://www.heroku.com/ via a standalone `canaryd` instance]

I'm happy to say that we've actually made canary useful!

This release lands basic Librato support as well as augments some underlying infrastructure to make it easier to do such things in the future.

This is particularly exciting, as canary users now have the ability to trend their measurements over the long-term, making it easy to spot changes in performance and availability. One could theoretically run instances of canaryd all over the world, gaining insight at a global perspective.

Need alerting when your site goes down? No problem. Enable monitoring and alerting against the metrics of your choice.

You can find all of the details on configuring your canaryd instances to use Librato here, along with detailed descriptions of the metrics being reported.

The relevant pull request can be seen here:

#13

Enjoy!

v2

Introduces canaryd command, which is similar to canary, but can monitor more than one site and receives its configuration via a JSON manifest.

v1

Initial release containing canary cli tool and core interfaces.