skyhawk

This release includes several enhancement which bring cernan's feature parity
much closer to both statsd and graphite. Additionaly, the concept of quality of
service per metric type has been added, allowing users to set the reporting
interval for gauges, counters, histograms, timers, and raw points.

Config files are now flat, and can be correctly parsed when running cernan with
the -C flag.

Support for the librato sink was removed, and aggregation was reintroduced to the
Wavefront sink since WF simply averages all points reported within sub-second
intervals.