Add support for setting tags for dogstatsd

[rtyler]

See the dogstatsd events format. I might end up implementing support for this myself, but allowing the setting of optional tags for reporting metrics (e.g. Gauges) makes statsd into datadog pretty darned useful.

[rtyler]

I suppose without any objections, I'll try to whip up a patchset for this soon :)

[scarytom]

There is already a fork of this project for dogstatsd. Are you planning something different?

[rtyler]

@scarytom do you happen to have a link? I've seem some stuff related to the dropwizard-metrics library that supports dogtatsd but not the raw statsd client

[scarytom]

https://github.com/indeedeng/java-dogstatsd-client -- they forked this codebase a while back -- look at the network diagram if you want to see when: https://github.com/tim-group/java-statsd-client/network

They do separate releases to maven central: http://search.maven.org/#search|gav|1|g%3A%22com.indeed%22%20AND%20a%3A%22java-dogstatsd-client%22