Update docs after building Travis build 501 of regro/regolith
Update docs after building Travis build 501 of
regro/regolith

The docs were built from the branch 'master' against the commit
249c25dae57791071c8e89b62f54b08814c23c9c.

The Travis build that generated this commit is at
https://travis-ci.org/regro/regolith/jobs/425259683.

The doctr command that was run is

    /home/travis/miniconda/envs/test/bin/doctr deploy . --deploy-repo ergs/regolith-docs --built-docs ./docs/_build/html

scopatz/regolith-docs,scopatz/regolith-docs