HTML Comment on stashed pages with info

[jeremybmerrill]

I had an Upton feature suggestion that would help with large scrapes like this. Would it
be possible when writing the scraped html out to the local copy to add some metadata
about the page to the top in html note format? Something like That way you could
preserve some information about the file even with human readable filenames
disabled.

Suggests @esagara

[jeremybmerrill]

@esagara, check it out.