4.0.0-BETA1

First beta release for the 4.0.0 series. This release unifies the statsd serialization code between the metrics 2 and 3 libraries and removes the "count" suffix that was previously appended to some metric types. The unification of statsd serialization primarily affects the metrics 2 library, as all metrics are now properly serialized as statsd gauges and never as timers (as the Metrics library is already coalescing timed metrics).