Show more tabs in pattern info area to document JS/JSX/SCSS files

[sbuckpesch]

We started documenting our ReactJS components using patternlab. So for each component I have more than just .md, .json and .mustache files.

So it would be really nice to have more public information in our styleguide without having my developers to checkout the styleguide git repo to see details about the React components, SCSS-files, ...

To enable this feature you could extend the config.yml file. Like the attributes ie and id you could have one called fileinfo containing a list of file extensions, which will exposed then 1:1 to a pattern info tab.