Further work on signup

Further work on https://github.com/e-Luminate/eluminate_web/issues/81:
- customize confirm email view so that we can provide a more helpful
  screen message when user has confirmed their email address to activate their
account, and so that we can supply a next querystring to the redirect
url to that they go to their event list screen after they log in.
- provide custom versions of the following so that we can make the
  screens look more like the rest of site and customise the wording to
be more helpful:
-- email address confirmation email sent
-- confirm the email address for your account
- provide custom version of the template for the confirm your email
  address to activate your account email
- provide a custom version of
  pinax_theme_bootstrap_account/context_processors.py which fetches
settings values from our eluminate_web/settings.py so that "email
address confirmation email sent" screen shows the correct contact email
instead of blank.