converted test asserts of generics-test to pytest

typo

As of PR #4377, `max_digits=None` is allowed for `DecimalField`.

converted generic relations assert to pytest style

Remove unnecessary "a"

docs: grammar fix

update django-filter to version 1.0.0

Edit to the import in Setting filter backends

`django_filters` doesn't export `rest_framework` by default so it's required to import it.

Correct a small typo in exceptions documentation

This is to address https://github.com/tomchristie/django-rest-raml/issues/5

The problem is that if you try to generate RAML docs when you haven't set up any views, you get the above error (min called on an empty list).  

unfortunately, this PR is not very helpful since it doesn't actually surface a readable error to the user.  Not sure what the best way to address this would be...

Bump release versions to 1.10.3, 1.9.11 and 1.8.16

More info on:

https://www.djangoproject.com/weblog/2016/nov/01/security-releases/

This change adds support to use `'autofocus': True` in the style options and have the `autofocus` attribute included on the input field when rendered.

Add documentation link for single 'field-level validation' to the Validator docs page (#3772) (#4657)