Simplify setup.py

[gdetrez]

• remove everything but setup()
• use setuptools' find_packages() to automatically build the list of packages.

[codecov-io]

Codecov Report

:exclamation: No coverage uploaded for pull request base (master@d40f3cc). Click here to learn what that means. The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #302   +/-   ##
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  Coverage          ?   37.67%           
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  Files             ?      165           
  Lines             ?    16311           
  Branches          ?     2905           
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  Hits              ?     6145           
  Misses            ?     9745           
  Partials          ?      421

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