Ticket429

We need the structured HTML5 in the server zip file, which is used to push publish via sword.

In the server work directory, we track the latest saved cnxml (index.cnxml) as well as the latest aloha-ized html4/5 soup (index.html).  The latter is used as input to the preview page.  The zip file also has within it an index.html file, but this file must the structured, canonical html5.