Controllable subprocess wrapper

[tony]

#337

[codecov]

Codecov Report

Merging #336 (ef26160) into master (0c0b37e) will increase coverage by 1.42%.
The diff coverage is 97.39%.

@@            Coverage Diff             @@
##           master     #336      +/-   ##
==========================================
+ Coverage   73.27%   74.69%   +1.42%     
==========================================
  Files          23       25       +2     
  Lines        1837     1952     +115     
==========================================
+ Hits         1346     1458     +112     
- Misses        491      494       +3     

Impacted Files	Coverage Δ
libvcs/utils/subprocess.py	94.73% <94.73%> (ø)
tests/utils/test_subprocess.py	100.00% <100.00%> (ø)

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