Implementation

This is my vision of how statsd metrics should be stored in InfluxDB.  I think this is in line with what others would expect.

Pretty thoroughly tested; just do `npm test`.
@otoolep The `license` property is MIT, as are the contents of the `LICENSE` file, which matches https://github.com/influxdb/influxdb/blob/master/LICENSE.  I don't see any inconsistencies here.