Support for srcset and relative URL for assets

[iloveip]

Hi there,

First of all, thank you very much for this plugin!

I'd like to ask. Is it possible to add srcset to an img tag?

Also, is it possible to output relative URLs for assets based on page/ post or document, so assets could be organised in subdirectories? Similar to this plugin https://github.com/samrayner/jekyll-asset-path-plugin (but it doesn't support collections).