Add SignalFx-aware CodahaleMetricsCollector

[nicmunroe]

No description provided.

[codecov-io]

Codecov Report

Merging #65 into master will increase coverage by 0.03%.
The diff coverage is 98.14%.

@@             Coverage Diff              @@
##             master      #65      +/-   ##
============================================
+ Coverage     90.71%   90.75%   +0.03%     
- Complexity     1999     2009      +10     
============================================
  Files           142      143       +1     
  Lines          5893     5929      +36     
  Branches        781      781              
============================================
+ Hits           5346     5381      +35     
- Misses          368      369       +1     
  Partials        179      179

Impacted Files	Coverage Δ	Complexity Δ
...odahale/SignalFxAwareCodahaleMetricsCollector.java	100% <100%> (ø)	7 <7> (?)
.../codahale/impl/SignalFxEndpointMetricsHandler.java	100% <100%> (ø)	22 <0> (ø)	⬇️
...ste/metrics/codahale/CodahaleMetricsCollector.java	95.69% <95.45%> (-0.94%)	28 <21> (+3)

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