Django-extensions

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Changes:

- Fix: pipchecker, pip 10.0.0 compatibility
- Fix: sqldiff, improve support of GIS fields by using Django introspection
- Fix: shell_plus, fix bug in windows when PYTHONPATH is defined
- Fix: shell_plus, Call execute on CursorWrapper instead of directly on cursor to ensure wrappers are run
- Fix: runserver_plus, Call execute on CursorWrapper instead of directly on cursor to ensure wrappers are run
- Improvement: sqldiff, drop old compatibility code
- Improvement: ForeignKeyAutocompleteAdminMixin, improvements for Django >1.9

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Changes:

- Fix: shell_plus, Fix of deprecation warning in collision resolvers

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Changes:

- Improvement: setup.py, Use PEP 508 when setuptools is version 36 or higher should fix issues with pipenv
- Fix: docs, Docs should show that django 2.0 is supported

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Changes:

- Fix: setup.py, fix installation of typing in python < 3.5

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Changes:

- Fix: shell_plus, python 2.7 support broken due to use of Python3 super()

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Changes:

- Improvement: sqldiff, add --include-defaults to include default value in missing field for sqldiff 1064