Some refactoring

[Leko]

Fixed #77

[codecov-io]

Codecov Report

Merging #78 into master will decrease coverage by 1.73%.
The diff coverage is 23.57%.

@@            Coverage Diff             @@
##           master      #78      +/-   ##
==========================================
- Coverage   31.66%   29.92%   -1.74%     
==========================================
  Files          14       21       +7     
  Lines         379      401      +22     
  Branches       46       43       -3     
==========================================
  Hits          120      120              
- Misses        232      254      +22     
  Partials       27       27

Impacted Files	Coverage Δ
packages/hothouse/src/cli/options.js	100% <ø> (ø)
packages/hothouse/src/BlackList.js	0% <0%> (ø)
packages/hothouse/src/Hosting/UnknownHosting.js	0% <0%> (ø)	⬆️
packages/hothouse/src/tasks/configure.js	0% <0%> (ø)
packages/hothouse/src/Hosting/GitHub.js	13.79% <0%> (ø)	⬆️
packages/hothouse/src/PackageManagerResolver.js	7.14% <0%> (ø)
...ckages/hothouse/src/RepositoryStructureResolver.js	7.14% <0%> (ø)
packages/hothouse/src/WorkerPool.js	0% <0%> (ø)
packages/hothouse/src/Package.js	55% <0%> (-17.23%)	⬇️
packages/hothouse/src/Engine.js	23.17% <16.66%> (+0.21%)	⬆️
... and 13 more

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