Refactor the CLI, part 3

[fghaas]

• Increase test coverage
• Put Git functionality into a separate helper class
• Update README and convert to reStructuredText, so it can be included in setup.py as the package's long_description.

[codecov-io]

Codecov Report

Merging #29 into master will increase coverage by 11.29%. The diff coverage is 96.87%.

@@             Coverage Diff             @@
##           master      #29       +/-   ##
===========================================
+ Coverage   87.03%   98.33%   +11.29%     
===========================================
  Files           6        8        +2     
  Lines         324      481      +157     
===========================================
+ Hits          282      473      +191     
+ Misses         42        8       -34

Impacted Files	Coverage Δ
tests/test_cli.py	100% <100%> (ø)	:arrow_up:
olxutils/git.py	100% <100%> (ø)
olxutils/templates.py	100% <100%> (ø)	:arrow_up:
tests/test_full_course.py	100% <100%> (ø)	:arrow_up:
tests/test_helpers.py	100% <100%> (ø)	:arrow_up:
olxutils/cli.py	95.12% <88.88%> (+27.12%)	:arrow_up:
tests/test_git.py	95.29% <95.29%> (ø)
olxutils/helpers.py	100% <0%> (+26.31%)	:arrow_up:

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[fghaas]

Alrighty, then we went from 30% to 90+% test coverage in a week. Doesn't suck. :)

[fghaas]

Thanks for reviewing!