Update docs.fineuploader.com to include downloading from bower

[rnicholus]

An `importing Fine Uploader page should definitely be updated to mention bower alongside npm. But I'm really not sure myself how developer who leverage bower can easily pull in CommonJS components. This is pretty easy with npm and Webpack or Rollup since both of those bundlers search node_modules by default, but I'm not sure how easy this is w/ bower.

It will need to be demonstrated how to require and import Fine Uploader modules when using bower instead of npm. Once that is complete, the "importing" doc page (referenced above) should be updated with specifics.

The source for docs is located in the docs directory in the fine-uploader repo.