NPM css files

I pulled bokehjs 1.4.0 from npm and the build/css/bokeh.min.css is empty. Is there a fix planned?

https://dev.jspm.io/npm:bokehjs@1.4.0/build/css/

@jonmeyer AFAIK, there is nothing to fix The CSS is now bundled in the JS files. We still publish a zero-length file for 1.4 for on the CDN compatibility, but that will stop with 2.0.

cc @mateusz