Django-axes

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- Add AXES_CACHE setting for configuring `axes` specific caching.
[JWvDronkelaar]

- Add checks and tests for faulty LocMemCache usage in application setup.
[aleksihakli]

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- Improve Windows compatibility on Python < 3.4 by utilizing win_inet_pton
[hsiaoyi0504]

- Add documentation on django-allauth integration
[grucha]

- Add documentation on known AccessAttempt caching configuration problems
when using axes with the `django.core.cache.backends.locmem.LocMemCache`
[aleksihakli]

- Refactor and improve existing AccessAttempt cache reset utility
[aleksihakli]

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- Fixes issue when not using `AXES_USERNAME_FORM_FIELD`
[camilonova]

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- *BREAKING CHANGES*. `AXES_BEHIND_REVERSE_PROXY` `AXES_REVERSE_PROXY_HEADER`
`AXES_NUM_PROXIES` were removed in order to use `django-ipware` to get
the user ip address
[camilonova]

- Added support for custom username field
[kakulukia]

- Customizing Axes doc updated
[pckapps]

- Remove filtering by username
[camilonova]

- Fixed logging failed attempts to authenticate using a custom authentication
backend.
[D3X]

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- Test against Python 2.7.
[mbaechtold]

- Test against Python 3.4.
[pope1ni]

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- Added form_invalid decorator. Fixes 265
[camilonova]