Currently when html only email is sent roundup rejects the email.

We should make roundup extract the text from the html and post that
(possibly with adding the html as an attachment).

To do this we need to change the mail gateway to find the html
portion of the email and convert to text. There are a few ways
to do the conversion:

  1) use an external program like links -dump
  2) use code like beautiful soup, nltk.clean_html()
  3) use the stupid little class/function attached that you
     can drop in utils as well if you wish.