This is deprecated API and will be dropped at some point, in favor
of projects shipping their own CSS.
Install and import the styles from PF4 now.
Update the travis config to run `make`, as `npm run build` by itself
doesn't generate the file.
Closes#315
It looks like Webpack is deprecating extract-text-webpack-plugin in favor of
mini-css-extract-plugin.
Discussion can be found here: webpack-contrib/extract-text-webpack-plugin#731
Closes#271
eslint is much more powerful and flexible than jshint, and we don't want
to promote writing new projects with pre-ES6 code.
As a side effect, this also avoids downloading PhantomJS (see
https://github.com/jshint/jshint/issues/3318), thereby cutting down
node_modules/ from 470 MB to 210 MB.