Although the gem is called jquery-fileupload-rails, the node package is
called blueimp-file-upload.
Note we're using the same version as provided by the gem.
The jquery-fileupload gem provided a `basic.js` file (which we were
requiring), which had the following content:
```
//= require jquery-fileupload/vendor/jquery.ui.widget
//= require jquery-fileupload/jquery.iframe-transport
//= require jquery-fileupload/jquery.fileupload
``
This file isn't available in the Node.js package, so we're adapting its
contents in our application.js file. Since we're already requiring
jQuery UI widget, we're omitting that line.
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