Parser: Improvements, tests

[tony]

Changes:

Parser:

• Fix port detection in svn and hg
• Add port detection to git
• Use rev to parse branch, tag, and references with git
• GitBaseURL and GitPipURL

[codecov]

Codecov Report

Merging #384 (9f87311) into master (0779804) will increase coverage by 0.24%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #384      +/-   ##
==========================================
+ Coverage   73.10%   73.34%   +0.24%     
==========================================
  Files          26       26              
  Lines        2145     2165      +20     
==========================================
+ Hits         1568     1588      +20     
  Misses        577      577              

Impacted Files	Coverage Δ
libvcs/parse/base.py	81.25% <ø> (ø)
libvcs/parse/hg.py	97.91% <ø> (ø)
libvcs/parse/svn.py	95.83% <ø> (ø)
libvcs/parse/git.py	98.41% <100.00%> (+0.33%)	⬆️
tests/parse/test_git.py	100.00% <100.00%> (ø)
tests/parse/test_hg.py	100.00% <100.00%> (ø)
tests/parse/test_svn.py	100.00% <100.00%> (ø)

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[tony]

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