Django-extensions

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Changes:

- Fix: Readme, add direct link to screencast video
- Fix: graph_models, regression under Python 2
- Fix: ForeignKeyAutocompleteAdmin, 2.0.8 breaks ForeignKeyAutocompleteAdmin
- Fix: AutoSlugField, fix regression when copying an autoslug model require the explicit clearing of the slug if it needs to be recalculated
- Fix: technical_response, check for AttributeError
- Improvement: graph_models, Add feature disable_abstract_fields
- Improvement: AutoSlugField, Add overwrite_on_add
- Improvement: runscript, Improve module existence test in runscript

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Changes:

- Fix: AutoSlugField, fix check on list or tuple type

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Changes:

- Fix: travis

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Changes:

- Improvement: use README as project description on PyPI

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Please stop using ForeignKeyAutocompleteAdmin edition :-)

Changes:

- Fix: special markers in runserver_plus.rst
- Fix: shell_plus, refactor reading pythonrc file outside of exec(compile(...))
- Fix: reset_db, fix default utf8 support
- Fix: autoslugfield, Fix autoslug generation when existing model is copied
- Improvement: Cleanup management commands options after argparse migration 916
- Improvement: sqldiff, add more tests
- Improvement: sqldiff, add DurationField and SearchVectorField
- Improvement: shell_plus, add more tests
- Improvement: shell_plus, backport macos fix for tab completion
- Improvement: clear_cache, add --all option
- Improvement: pipchecker, treat dev versions as unstable
- Deprecation: ForeignKeyAutocompleteAdmin, Django 2.0 has similar capabilities, which are much better supported.