Django-extensions

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Changes:

- Improvement: travis, add Python 3.8
- Improvement: setup.py, update classifiers

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Changes:

- Improvement: RandomCharField, Support unique_together
- Improvement: export_emails, add settings for overriding queryset fields, order_by and the full_name function

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Changes:

- Fix: admin widgets, fix import of static template tag (part 2)

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Changes:

- Fix: autoslugfield, find unique method overrideable
- Fix: notes, do not replace dot in template dirs
- Fix: admin widgets, fix import of static template tag
- Improvement: print_user_for_session, use session backend
- Improvement: sqlcreate, postgis support
- Improvement: graph_models, permit combination of includes and excludes
- Improvement: Adds missing GIS engine to DEFAULT_MYSQL_ENGINES
- Improvement: sqldiff, use lowercase field names in MySQL
- Improvement: sqldiff, mysql code could duplicate AUTO_INCREMENT and UNSIGNED statements

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Changes:

- Fix: tests, support for newer versions of pytest
- Fix: tests, disable test with drf dependency for older python versions

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Changes:

- Fix: removing wrongly released text_tags template
- Fix: graph_models, support for Python <3.6
- Improvement: ForeignKeySearchInput, wrap media files in static()
- Improvement: UniqField, added tests
- Improvement: dumpscript, fix orm_item_locator to use dateutil
- Improvement: graph_models, added argument to change arrow_shape