Django-mail-factory

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- Added Form.get_preview_data(): provide custom data to override the form's data

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- Create a password_reset generic views that use mail factory to send the confirmation email.

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- Fixes 18 - Return object from get_context_data ModelChoicesField
- 17 - Display image in Previews

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- only display the email preview link to the html alternative if it exist
- full test coverage (100%)
- refactor/rewrite (cleanup, no more meta-programming)
- merged email previewing in MailForm
- now uses tox, added py33 to travis
- ported to python3
- fixed error with mail_admin (was "working" with django<1.5)

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- Added email previewing (with fake data): https://django-mail-factory.readthedocs.org/en/latest/interface.html#previewing-your-email
- Added ``factory.get_mail_object``
- Renamed ``factory.get_mail_object`` to ``get_mail_class``
- Added ``get_text_for`` and ``get_subject_for`` to the factory
- Some refactoring

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- Custom base mail form in the factory
- Strip subject