WIP: Added Shrink/Retry

[CodeLenny]

Closes #1

[codecov-io]

Codecov Report

Merging #23 into master will decrease coverage by 30.26%.
The diff coverage is 45.23%.

@@             Coverage Diff             @@
##           master      #23       +/-   ##
===========================================
- Coverage     100%   69.73%   -30.27%     
===========================================
  Files           3        7        +4     
  Lines          36       76       +40     
===========================================
+ Hits           36       53       +17     
- Misses          0       23       +23

Impacted Files	Coverage Δ
lib/FailureDetails.js	10% <10%> (ø)
lib/TestDetails.js	100% <100%> (ø)
lib/FailedTestError.js	100% <100%> (ø)
lib/ExtendableError.js	16.66% <16.66%> (ø)
AVAVerify.js	80% <47.05%> (-20%)	⬇️

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