Support easy generation of static sites from MObtvse

[masukomi]

One of the greatest things about systems like Octopress is that the resulting sites are static, and serve lightning fast.

One of the downsides is that they take forever because they have to regenerate every page. Typical solutions for creating static sites from rails apps involve pointing wget at the entire site. This is worse than generating every page because it also involves http requests.

I think a good solution would be to have an API that remote cron scripts could check to see what files have changed since the last check and then download the updated versions of just those.