Proper 'primary key' checking on to_fields.

Allow HTML to render when no filter_class is defined.

Request parsing when .POST accessed

docs - reverse needs kwargs keyword

Since we aren't passing in any args, we must specify kwargs as a keyword
argument.

typo

Add section permalinks to docs

fix image paths

Updated readme to reflect 3.3 release

Add compat util for DecimalValidator

Fix trans template tag error on admin

Adds import for `Response`

typo on relations docstring

Added django-rest-framework-version-transforms.

Fix announcement link typo

Trans template tag requires `{% load i18n %}` at top of template.

format_html was missing in optional_logout template-tag

Previously it required a filter_class,
or else it would error when calling `cls()`.
This now sets the `filter` context to `None`
if one does not exist.

Fixes #3559

The new format_html() was still missing in optional_logout template-tag
at the NoReverseMatch exception.

Update bootstrap from 3.2.0 to 3.3.5

- Configure mkdocs to use the toc markdown extension
- Only show section link styles on hover