Reset recomputations

[skortchmark9]

Addresses #26

Also, fixes up unit tests for extension & a couple housekeeping items.

[codecov-io]

Codecov Report

Merging #33 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master    #33   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           1      1           
  Lines          20     20           
=====================================
  Hits           20     20

Impacted Files	Coverage Δ
src/index.js	100% <ø> (ø)	⬆️

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[coveralls]

Coverage remained the same at 98.246% when pulling 4e19d3d on reset-recomputations into 1175df8 on master.

[omgoshjosh]

I approve!