v9.1.0

This release updates our stylelint config to v2.0.0, and to stylelint v7.13.0. Each module also now has a lint npm script, and there are top-level test and lint scripts that you can use to lint and test all modules in one go.

This release also includes major improvements to our Travis build scripts to automatically publish PR builds, release candidates, and the "final" versions to npm.