Update to django-email-confirmation

[bradbeattie]

Adds HTML email support

[paltman]

Brad,

Really appreciate your patch here and like the idea of email-confirmation supporting HTML emails, however, I would like to see it as an optional addition driven by a setting that defaults to False. So if something like EMAIL_CONFIRMATION_HTML_EMAILS = True is in settings.py then do the multipart building and rendering of the HTML template, otherwise, it functions as it always has.

Does that make sense?

Thanks,
Patrick