reinh/statsd — pull request #29 by petemounce (2012-12-10 13:02:26+00:00)
Title: Add support for the "set" stat type.

From the [etsy/statsd](http://github.com/etsy/statsd)/README.md,

StatsD supports counting unique occurences of events between
flushes, using a Set to store all occuring events.

This change adds support for sending metrics of the `set` type to a statsd server.

**Note**: I'm not convinced I've fully understand the intent of the event-type (see the rdoc I wrote), but I'm pretty sure the code is doing the correct thing.