• #145 Allow custom exceptions to be raised by all AccessMixins.
• #171 New SSLRequiredMixin. Redirect http -> https.
• #138 New RecentLoginRequiredMixin to require user sessions to have a given freshness.
• #164 Use resolve_url to handle LOGIN_REDIRECT_URLs in settings.py that are just URL names.
• #130 New attribute on JSONResponseMixin to allow setting a custom JSON encoder class.
• #131 New attribute on LoginRequiredMixin so it's possible to redirect unauthenticated users while
  using AccessMixin-derived mixins instead of throwing an exception.