Tracing

[markphelps]

Add OpenTracing/Jaeger support!

[codecov-commenter]

Codecov Report

Merging #315 into master will increase coverage by 0.13%.
The diff coverage is 93.33%.

@@            Coverage Diff             @@
##           master     #315      +/-   ##
==========================================
+ Coverage   81.28%   81.42%   +0.13%     
==========================================
  Files          16       16              
  Lines         999     1028      +29     
==========================================
+ Hits          812      837      +25     
- Misses        155      157       +2     
- Partials       32       34       +2     

Impacted Files	Coverage Δ
config/config.go	88.42% <92.72%> (-2.32%)	⬇️
storage/db/db.go	93.54% <95.00%> (+2.24%)	⬆️

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