Django-extensions

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Changes:

- New: drop_test_database, drops the test database
- New: command_signals, git commit -a -m 'bumped version number' (see docs)
- Bugfix: runserver_plus, removed empty lines when logging on Python 3

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Changes:

- Bugfix: validators, fix NoWhitespaceValidator __eq__ check

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Changes:

- New: validators.py, NoControlCharactersValidator and NoWhitespaceValidator
- New: EmailNotificationCommand class, email exceptions from Django Commands
- Improvement: runserver_plus, enable threading by default and added --nothreading
- Improvement: runscript, better detection when import error occured in script
- Improvement: runscript, use EmailNotificationCommand class
- Deprecation: deprecated UUIDField since Django 1.8 will have a native version.
- Removed: completely remove support for automatically finding project root.

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Changes:

- Improvement: sqldiff, fix for dbcolumn not used in few places when generating the sqldiff
- Fix: sqldiff, backwards compatibility fix for Django 1.4
- Fix: ForeignKey Field, handling of __str__ instead of __unicode__ in python3

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Changes:

- New: clear_cache, Clear django cache, useful when testing or deploying
- Improvement: AutoSlugField, add the possibility to define a custom slugify function
- Improvement: shell_plus --notebook, add a big warning when the notebook extension is not going to be loaded
- Improvement: setup.py, add pypy classifier
- Improvement: readme, add pypy badges
- Fix: admin_generator, Fixed Python 3 __unicode__/__str__ compatibility

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Changes:

- Fix: admin_generator, fix ImproperlyConfigured exception on Django 1.7
- Improvement: Remove "requires_model_validation" and "requires_system_checks" in commands which set the default value