added #nocov tags to included headers

[eddelbuettel]

No description provided.

[codecov-io]

Codecov Report

Merging #23 into master will increase coverage by 7.73%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #23      +/-   ##
==========================================
+ Coverage   54.92%   62.66%   +7.73%     
==========================================
  Files           5        2       -3     
  Lines        1331      233    -1098     
==========================================
- Hits          731      146     -585     
+ Misses        600       87     -513

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