Relative URLs for entries confused TwitterFeed.com, so we now use the full URL. Previously, the <updated> element of <feed> wasn't dynamic. Now it's set to the date of the most recent entry.
We previously ignored IDs of h tags numbered lower than 3. Now we store them in the ToC. This lets us fix cross-links to specific sections in other recipes. IOW, it lets recipe A link to recipe B#section.