Django-docusign

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Bugfixes & refactoring, mostly around ``SignatureCallbackView``.

- Bug 20 - In ``SignatureCallbackView``:

* ``update_signature`` is not triggered if signature is not updated, when a
signer, not the last, has just signed the envelope.

* ``update_signer`` is triggered for every signer when signature and signers
have "Sent" status (signature has just been created in embedded mode).

- Features 16 and 20 - In demo application, ``SignatureCallbackView`` is
tested using ``pydocusign``'s templates.

- Bug 17 - In demo application, added tests around settings view... and fixed
it, so that it works as expected.

- Bug 18 - In demo application, replaced using ``iterator.next()`` instead of
``list(iterator)[0]``.

- Refactoring 19 - Removed deprecaded ``SignatureCallbackView.clean_status``.
Use ``pydocusign.DocuSignCallbackParser.envelope_status`` instead.

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Custom email subject and blurb.

- Feature 10 - DocuSignBackend.create_signature accepts ``subject`` and
``blurb`` arguments, in order to customize email subject and body for
DocuSign messages and embedded signing page.

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Improvements around multiple signers.

- Feature 13 - ``DocuSignCallbackView`` also handles recipient notifications.

- Feature 11 - Improved ordering of signers, better management of DocuSign's
``routingOrder``.

- Feature 12 - Demo project shows how to implement signature of multiple
signers.

- Bugfix 9 - Fixed default value of ``signer_return_url`` in
``DocuSignBackend.post_recipient_view()``. Default value was not assigned
if value was not passed as argument.

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- Feature 7 - Introduced ``django_docusign.SignatureCallbackView``, as a
generic view to handle DocuSign's notification callbacks. Simplified demo's
code.

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Updated demo to manage DocuSign API callbacks.

- Feature 1 - Introduced support for DocuSign API callbacks (envelope
updates). At the moment, the feature is mostly made of sample code in the
demo project. It shows how `django-docusign` can be used to handle DocuSign's
API callbacks. The idea is to let users try the feature then, later, add most
useful parts in ``django_docusign`` package.

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Introduced demo application (with tests).

- Feature 4 - Introduced demo application: illustrate and test API usage.

- Feature 3 - On signature creation, tabs can be computed by backend.