Django-x509

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* [django] added support for django 1.11

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* [models] improved reusability by providing abstract models
* [admin] improved reusability by providing abstract admin classes
* [views] provided a base view that can be reused by third party apps
* [docs] documented how to extend models and admin
* [docs] documented hard dependencies

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* [model] avoid import error if any imported field is ``NULL``
* [admin] added ``serial_number`` to ``list_display`` in ``Cert`` admin
* [model] avoid exception if x509 subject attributes are empty

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* improved general ``verbose_name`` of the app
* added official compatibility with django 1.10
* [admin] show link to CA in cert admin
* [admin] added ``key_length`` and ``digest`` to available filters

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* fixed x509 certificate version
* renamed ``public_key`` field to more appropiate ``certificate``
* show x509 text dump in admin when editing objects

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* CA and end entity certificate generation
* import existing certificates
* x509 extensions
* revocation
* CRL