Author of MDwiki here. Versioning and editing is indeed intended to be done and handled through git. Pull requests are prefered method for collaboration. Another way is to place the wiki on a Dropbox shared public folder and share the folder with your collaborators. Hosting can be done through Dropbox as well.

In that case, I just came up with some awesome new minimalist wiki software: it's called 'plain text files in a git repository'.

I had the same thought as the parent of your comment, but I really like this way of doing things, well done. Looks really clean and I'd consider using it if I needed a wiki for some project.

Seems like hosting it on GitHub Pages would accomplish that.