Overhaul docs, packaging, 1.5rc

[tony]

See also: vcs-python/libvcs#270

[codecov]

Codecov Report

Merging #303 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #303   +/-   ##
=======================================
  Coverage   80.88%   80.88%           
=======================================
  Files          12       12           
  Lines         659      659           
=======================================
  Hits          533      533           
  Misses        126      126           

Impacted Files	Coverage Δ
vcspull/cli.py	59.55% <ø> (ø)
vcspull/cli_defaultgroup.py	53.70% <ø> (ø)
vcspull/config.py	95.27% <ø> (ø)
vcspull/util.py	100.00% <ø> (ø)

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