npm publish is broken on travis

[stdavis]

https://travis-ci.com/agrc-widgets/map-tools/builds/76725433

[steveoh]

Looks like you need to npm install before you call grunt

[stdavis]

Ya, but that's already done at the beginning of the build. It uses grunt to run the tests, lint, etc. But is the publish a clean slate or something?

[steveoh]

https://docs.npmjs.com/misc/scripts

prepublish: Run BEFORE the package is packed and published, as well as on local npm install without any arguments. (See below)

The wording there is confusing. Maybe a different point is better suited?