Generate notebooks

[kdheepak]

Uses code from #37. Thanks to @ptn111 for the implementation.

[codecov]

Codecov Report

Merging #39 (bb0179e) into master (db71f2f) will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master     #39   +/-   ##
======================================
  Coverage    7.52%   7.52%           
======================================
  Files           3       3           
  Lines          93      93           
======================================
  Hits            7       7           
  Misses         86      86           

Flag	Coverage Δ
unittests	7.52% <ø> (ø)

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[claytonpbarrows]

This will only create the notebook if the src .jl file has changed since the last time the notebook was written. Is it guaranteed that the notebooks don't exist when this runs. If not, I'd suggest using SIIPExamples.literate_all(force=true)

[kdheepak]

Yes, there are no notebooks in this repository. So no need to add force=true. But we can add it to be safe.