Django-axes

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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]

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- Fix DeprecationWarning for logger warning
[richardowen]

- Fixes global lockout possibility
[joeribekker]

- Changed the way output is handled in the management commands
[ataylor32]

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- BREAKING CHANGES. Support for Django >= 1.11 and signals, see issue 215.
Drop support for Python < 3.6
[camilonova]