Fix #268 -- Add tests and docs to source distribution

[codingjoe]

[codecov-commenter]

Codecov Report

Merging #271 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #271   +/-   ##
=======================================
  Coverage   72.75%   72.75%           
=======================================
  Files          34       34           
  Lines         400      400           
  Branches       40       40           
=======================================
  Hits          291      291           
  Misses        103      103           
  Partials        6        6           

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