min-width and max-width being ignored

[Smylers]

min-width and max-width seem to be being ignored; the changelog says they've been supported since version 0.8.

See: http://www.stripey.com/demo/weasyprint/min_max-width.html and http://www.stripey.com/demo/weasyprint/min_max-width.pdf

The min-width should be stretching the second paragraph to be the same width as the width does one the first. And the max-width on the final paragraph should be constraining it like width does on the fourth one.

That's what happens in browsers, but in WeasyPrint (I checked with version 0.16), the min-width and max-width are having no affect.