Make pip-friendly (pip install -e <path>)

[marcusj]

No description provided.

[codecov-io]

Codecov Report

Merging #191 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #191   +/-   ##
=======================================
  Coverage   89.57%   89.57%           
=======================================
  Files          48       48           
  Lines        1564     1564           
  Branches      103      103           
=======================================
  Hits         1401     1401           
  Misses        163      163

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