Don't show HTML in Hansard appearance excerpts

This suppresses the `<p>` tags that appear on pages like this:

  http://www.pa.org.za/person/cameron-mackenzie/

I think there's a chance that `speech.text` could contain `<p>` tags (because they are in `BLEACH_ALLOWED_TAGS`), so perhaps it would be best if this was wrapped in a `<div>` or similar?