Publish standalone neb.js in browser on CDN like cdnjs, jsDelivr

[fbzhong]

Hi,

It's would be much easier to use standalone neb.js (nebulas.js) in browser with public CDN url, like: https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js

I think cdnjs and jsDelivr are good sites for hosting:

jsDelivr: https://www.jsdelivr.com/

CDNJS: https://cdnjs.com/

For the new library request issue, please make sure it's not a personal project, we have a basic requirement for the popularity, like 200 stars on GitHub or 800 downloads/month on npm registry.