Tg-apicore

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* Add Usage section to README (to make starting up easier)
* Most ``REST_FRAMEWORK`` settings are now automatically configured by Thorgate API Core.
Users only need to specify ``ALLOWED_VERSIONS``, the rest is optional.

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* Fix packaging (tg_apicore subdirs weren't included)

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* Added PageNotFoundView (JSON-based 404 views)
* Added DetailSerializerViewSet (different serializers and queryset for list/detail/edit views)
* Added CreateOnlyFieldsSerializerMixin, ModelValidationSerializerMixin and BaseModelSerializer
* Renamed APIDocumentationView.get_patterns() to .urlpatterns()
* Improved example app a lot. It now also includes tests that partially test tg-apicore itself

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* First release on PyPI.