Cache Everything

[markphelps]

Fixes: #100

Adds ability for in-memory cache for all reads

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@7a9879b). Click here to learn what that means.
The diff coverage is 87.16%.

@@            Coverage Diff            @@
##             master     #215   +/-   ##
=========================================
  Coverage          ?   85.54%           
=========================================
  Files             ?       18           
  Lines             ?     1681           
  Branches          ?        0           
=========================================
  Hits              ?     1438           
  Misses            ?      160           
  Partials          ?       83

Impacted Files	Coverage Δ
storage/cache/cache.go	0% <0%> (ø)
config/config.go	89.58% <100%> (ø)
storage/db/segment.go	82.29% <100%> (ø)
storage/cache/segment.go	90.16% <100%> (ø)
storage/db/evaluation.go	79.22% <100%> (ø)
server/evaluator.go	90.76% <100%> (ø)
server/flag.go	100% <100%> (ø)
storage/db/rule.go	75.2% <100%> (ø)
server/rule.go	100% <100%> (ø)
storage/db/flag.go	81.69% <100%> (ø)
... and 5 more

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