Codahale Metrics Filter configurable with Archaius

As discussed recently on the Hystrix OSS Mailing List, we have a requirement to filter the metrics published to Graphite via Codahale in a 'dynamically-configurable' fashion.

The neatest way to do this appeared to be to implement a CodaHale MetricsFilter with a reference to the Archaius DynamicPropertyFactory.

Thought I'd submit this pull request should the community feel it is useful