relative URL for image paths

[miklb]

Would there be an easy way to write media files with relative paths?

I'm setting up to use s3 to serve my images and it would be nice to be able to just use the page.mf-photo in a liquid tag that is mapped to the CDN.

I realize this might be out of scope for someone who's using hosted gh-pages, but might be beneficial incase someone changes domain names or start with GitHub subdomain then get their own.