nested divs within content (JohnD); fixed missing sys import (JohanS);
fixed regular expression to capture XML character encoding (Andrei);
added support for Atom 0.3-style links; fixed bug with textInput tracking;
added support for cloud (MartijnP); added support for multiple
category/dc:subject (MartijnP); normalize content model: 'description' gets
description (which can come from description, summary, or full content if no
description), 'content' gets dict of base/language/type/value (which can come
from content:encoded, xhtml:body, content, or fullitem);
fixed bug matching arbitrary Userland namespaces; added xml:base and xml:lang
tracking; fixed bug tracking unknown tags; fixed bug tracking content when
<content> element is not in default namespace (like Pocketsoap feed);
resolve relative URLs in link, guid, docs, url, comments, wfw:comment,
wfw:commentRSS; resolve relative URLs within embedded HTML markup in
description, xhtml:body, content, content:encoded, title, subtitle,
summary, info, tagline, and copyright; added support for pingback and
trackback namespaces