Drf-yasg

Fixed some deployment issues.

- **ADDED:** ``basePath`` is now generated by taking into account the ``SCRIPT_NAME`` variable and the
longest common prefix of API urls (37, 42)
- **IMPROVED:** removed inline scripts and styles from bundled HTML templates to increase CSP compatibility
- **IMPROVED:** improved validation errors and added more assertion sanity checks (37, 40)
- **IMPROVED:** improved handling of ``NamespaceVersioning`` by excluding endpoints of differing versions (i.e. when accesing the schema view for v1, v2 endpoints will not be included in swagger)

- **FIXED:** schema view cache will now always ``Vary`` on the ``Cookie`` and ``Authentication`` (the
``Vary`` header was previously only added if ``public`` was set to ``True``) - this fixes issues related to Django authentication in ``swagger-ui`` and ``CurrentUserDefault`` values in the schema

- **IMPROVED:** updated ``swagger-ui`` to version 3.8.1
- **IMPROVED:** removed some unneeded static files

- **ADDED:** generate_swagger management command (29, 31, thanks to beaugunderson)
- **FIXED:** fixed improper generation of ``\Z`` regex tokens - will now be repalced by ``$``

- **ADDED:** added support for APIs versioned with ``URLPathVersioning`` or ``NamespaceVersioning``
- **ADDED:** added ability to recursively customize schema generation using pluggable inspector classes
- **ADDED:** added ``operation_id`` parameter to `swagger_auto_schema`
- **ADDED:** integration with `djangorestframework-camel-case` (28)
- **IMPROVED:** strings, arrays and integers will now have min/max validation attributes inferred from the field-level validators
- **FIXED:** fixed a bug that caused ``title`` to never be generated for Schemas; ``title`` is now correctly populated from the field's ``label`` property