Add missing copyright, cleanup and fix docs

[zhiqwang]

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[codecov]

Codecov Report

Merging #110 (2d24867) into master (66b8330) will not change coverage.
The diff coverage is n/a.

❗ Current head 2d24867 differs from pull request most recent head 909a6aa. Consider uploading reports for the commit 909a6aa to get more accurate results

@@           Coverage Diff           @@
##           master     #110   +/-   ##
=======================================
  Coverage   83.54%   83.54%           
=======================================
  Files           8        8           
  Lines         784      784           
=======================================
  Hits          655      655           
  Misses        129      129           

Flag	Coverage Δ
unittests	83.54% <ø> (ø)

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