Turn warnings into errors when building doc

Created by: martinRenou

Have the tests fail when there is a warning in the sphinx generation.

Created by: codecov-io

Codecov Report

Merging #54 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #54   +/-   ##
=======================================
  Coverage   76.42%   76.42%           
=======================================
  Files          49       49           
  Lines         666      666           
  Branches       40       40           
=======================================
  Hits          509      509           
  Misses        146      146           
  Partials       11       11

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