Django-envelope

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- fixed ``NameError`` in example project

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- Python 3 compatibility!

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- fixed template loading in tests

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- contact form class is more customizable
- the ``Reply-To`` header in the message is set to whatever the submitted
email was
- added ``after_send`` signal
- `django-honeypot`_ is now just an optional dependency
- ``example_project`` is no longer incorrectly distributed with the application

.. _`django-honeypot`: https://github.com/sunlightlabs/django-honeypot

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- security bugfix regarding initial form values

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- removed the function-based view
- removed ``ContactForm.send()`` method
- application signals (``before_send``)
- updated documentation
- reworked settings
- Continous Integration server, thanks to ShiningPanda