Cache busting of assets #42
Description
Implement some kind of cache-busting strategy so visitors always get the most recent versions of the site's JavaScript, CSS and metadata JSON.
Appending a querystring parameter in the liquid template is the easiest, but isn't exactly the correct way to do it.
URL rewriting won't work because of GitHub pages.
Renaming files and templatizing their names seems the most correct way, but this wouldn't work with the safe-mode Jekyll on GitHub pages. This would require building using Travis or some other system and pushing to GitHub.