Integration with sphinxcontrib-screenshot

[azmeuk]

Hi. I would like to use sphinxcontrib-images with sphinxcontrib-screenshot (which is an extension that takes screenshot of websites/apps). sphinxcontrib-screenshot defines its own directive .. screenshot:: which internally inherit from the image directive.

I don't realize how hard this would be to bring some kind of genericity to let sphinxcontrib-images apply on other kind of directives.

What do you think?