We were passing DOM nodes directly into the queues for the final bookmark import stage; unfortunately these don't actually survive serialization.
Moved the extraction of properties from the HTML up to the first-stage handler, so now we don't have to worry about moving DOM nodes from one handler to the next. Instead passing an associative array of properties, which is fed into the Bookmark::saveNew by the per-bookmark handler.
Had some problems with PuSH and Salmon use of Bookmarks; they were
being required to generate Atom versions of the bookmark _before_ the bookmark was saved.
So, I reversed the order of how things are saved, and associate notices and bookmarks
by URI rather than notice_id.
