Add ability to get to tags of any file, including HTML

[csells]

e.g. the following is one of my posts. Notice the use of tags at the top inside an HTML comment. I need access to those when generating the content for that page.

<!--
Date: 8/13/2003 12:03:55 PM  -08:00
Permalink: 748
Disqus: 748
-->
<h1>Robert Scoble on Interviewing at Microsoft</h1>
Robert Scoble (<a href="http://radio.weblogs.com/0001011">the Scobleizer</a>) contributes his answer to the eternal question: <a href="/12390">what's it like to interview at Microsoft</a>?

[matthew-carroll]

Page properties are now accessible from HTML files.