Django-newsletter-signup

- Fixed verification view
- Made sure that `initial_source` and `initial_referer` really only get saved
in the session when the user visits the site for the first time.
- Added new field `current_referer`
- Bumped to 100% test coverage (but had to cheat in one test)

- Prepared app for Django 1.10
- Fixed email creation and ajax template response
- Improved admins
- Fixed MANIFEST.in
- re-setting the state of the modal to not shown when forcing the modal
- Fixed ``NEWSLETTER_SIGNUP_FORCE_MODAL`` setting
- Added ``has_seen_modal`` template tag

- Added setting to toggle if name is required for newsletter signup (default is
False = only email required)
- Added setting to toggle verification process (default is False = not required)
- Extended forms and views to allow optional verification
- Simplified NewsletterSignupView
- Added NewsletterSignupSuccessView
- Updated NewsletterSignup model
- added first_name, last_name, source and referer field
- added descriptors for compatibility with projects using creation_date
instead of signup_date
- Made the app ready for Django 1.8-1.9 and Python2.7-3.5
- Entirely recreated migrations for Django>1.8

- added check_newsletter_signups command
- improved admin

- Initial commit