Add setup.py

[tlkamp]

This PR makes ouroboros installable by pip. When ouroboros is installed by pip, ouroboros is available in the user's path.

There should be no notable difference in the documentation.

run_tests.sh still works.

Closes #28

[codecov-io]

Codecov Report

Merging #40 into master will increase coverage by 0.07%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #40      +/-   ##
==========================================
+ Coverage   96.35%   96.42%   +0.07%     
==========================================
  Files           7        7              
  Lines         137      140       +3     
==========================================
+ Hits          132      135       +3     
  Misses          5        5

Impacted Files	Coverage Δ
ouroboros/logger.py	100% <ø> (ø)	⬆️
ouroboros/ouroboros	100% <100%> (ø)
ouroboros/cli.py	100% <100%> (ø)	⬆️
ouroboros/main.py	86.66% <100%> (-3.81%)	⬇️

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[circa10a]

Should we modify the Travis build to push to pypi as well?

[tlkamp]

We could! Never done that before. Have you?

This also might be a major version bump.

[circa10a]

Yeah I have, It should actually still be in the history of the .travis.yml.
I'll see about getting it in there later on. At an event at the moment

[circa10a]

Also will need to update deploy.sh to get the package version from setup.py instead of init.py