Remote urls without download

[trollybaz]

Hi, it is possibly to simply reference a remote image url using
carrierwave programmatically? Basically something like this:

1. Initially set the image url to a remote public facebook image url.
I don't want to download the facebook image, but simply be able to
refer to it
2. If the user wants to change their profile image, then I would store
an uploaded image locally. I can do this step without issues.

I'm stuck on #1- I can set remote_image_url, but this actually
downloads the image and stores it.

Thanks!
Frank