Django-ratelimit3

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- Added Django 1.10 support.

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- Allow requests through when cache backend is unavailable.
- Add support for Django 1.9, drop support for Django <=1.7.
- Fix several small documentation issues.
- Fix support for missing headers.

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- Fix CBV inheritance.
- Better Django 1.8 support, fixing deprecation warnings and testing.
- Clean up some out-of-date docs.
- Fix counting behavior around increment and new cache keys.
- Correctly pass `group` to callable `key`s.

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- Rates are now counted in fixed—instead of sliding—windows, except for
per-second limits. See the Upgrade Notes.
- Mixin renamed to `RatelimitMixin` (lowercase `l`) for consistency.
- Dramatic rewrite.
- `ip`, `field`, and `keys` arguments replaced with `key`.
- well-known "key" values support.
- Custom callable rate functions.
- Support for "not limited" rate.
- Replaces ``skip_if`` argument.

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- (Sort of) make ratelimit decorators stack.
- Add RateLimitMixin for CBVs.
- Fixes for Python <2.7.
- Clean up Travis and tox tests.

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- Drop the 'Backend' concept.
- Add settings: RATELIMIT_USE_CACHE and RATELIMIT_CACHE_PREFIX.
- Allow custom key functions.
- Tests with Django 1.4.x and 1.5.x.
- Refactor to simplify tests and development requirements.