Parsing tests

[tony]

Fixes #382

Follow up to #374

Subversion, Mercurial parsing:

• Fixes
• doctests
• Add pytest modules

[codecov]

Codecov Report

Merging #381 (363000e) into master (b570af1) will increase coverage by 1.33%.
The diff coverage is 99.04%.

@@            Coverage Diff             @@
##           master     #381      +/-   ##
==========================================
+ Coverage   71.76%   73.10%   +1.33%     
==========================================
  Files          24       26       +2     
  Lines        2054     2145      +91     
==========================================
+ Hits         1474     1568      +94     
+ Misses        580      577       -3     

Impacted Files	Coverage Δ
libvcs/parse/svn.py	95.83% <91.66%> (+2.50%)	⬆️
libvcs/parse/hg.py	97.91% <100.00%> (+5.05%)	⬆️
tests/parse/test_hg.py	100.00% <100.00%> (ø)
tests/parse/test_svn.py	100.00% <100.00%> (ø)

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