feat(libvcs.cmd): Lite, typed, pythonic command wrappers for git, hg, mercurial

[tony]

Lite, typed, pythonic command wrappers for git, hg, mercurial

[codecov]

Codecov Report

Merging #319 (3200ec5) into master (dee9d2d) will decrease coverage by 8.19%.
The diff coverage is 58.14%.

❗ Current head 3200ec5 differs from pull request most recent head 6f318f1. Consider uploading reports for the commit 6f318f1 to get more accurate results

@@            Coverage Diff             @@
##           master     #319      +/-   ##
==========================================
- Coverage   85.69%   77.50%   -8.20%     
==========================================
  Files          18       21       +3     
  Lines         965     1356     +391     
==========================================
+ Hits          827     1051     +224     
- Misses        138      305     +167     

Impacted Files	Coverage Δ
libvcs/cmd/svn.py	52.23% <52.23%> (ø)
libvcs/cmd/git.py	57.89% <57.89%> (ø)
libvcs/cmd/hg.py	69.73% <69.73%> (ø)
libvcs/cmd/core.py	90.54% <100.00%> (ø)
libvcs/states/base.py	100.00% <100.00%> (ø)
tests/cmd/test_core.py	100.00% <100.00%> (ø)
tests/states/test_conftest.py	100.00% <100.00%> (ø)
tests/states/test_git.py	99.38% <100.00%> (ø)
tests/states/test_hg.py	95.23% <100.00%> (ø)
tests/states/test_svn.py	96.15% <100.00%> (ø)

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