Quill now supports posting RSVPs! When you are replying to a URL that is an h-event, Quill will add an RSVP field to the post and let you choose between "Yes", "No", "Maybe" and "Interested".
Quill includes a new property "rsvp" in the post set to the value you choose! Since my site already understands the "rsvp" property, it renders the RSVP differently from normal posts.
