Update edX DRF fork to v3.6.3 plus patch.

version 3.6.3

Version 3.6.3

Add ValidationError to except in get_object_or_404 for django 1.11

Fix DjangoFilterBackend mro

Fix a typo in a comment

Simplify django-filter docs, add drf integration link

Generate schema with respect to http_method_names provided by CBV

Set self.count before self.limit in LimitOffsetPagination

Fix partial update for the ListSerializer.

Fixed render error of required nested serializer.

Refs #5108

Refs #5108.

Improve grammar in .force_authenticate() docs

Updating the Django version "runserver" output and enforcing code block styling

CHANGED the Django version run server output to “1.11”
ADDED “```” to a code block on line 44 of
“/tutorial/7-schemas-and-client-libraries/“ to enforce code wrap.
Perhaps, we might need to do this to all code blocks. I would be happy
to do that.

* Remove unnecessary comma
* Remove the "and simple" copied from the line above.
* Add "entirely" to emphasize that this function bypasses the authentication step.

PoC Add JSONBoundField to serializers (Fixes #4999)

Added test for DateTimeField validation when server has timezone with…

Restrict doc & schema shortcuts to a subset of urls

SchemaGenerator: Avoid crashing with pagesizeless paginators

add URL path unquote to HyperlinkedRelatedField.to_internal_value

Per issue #4999, JSONFields are not rendered properly in the DRF
browsable API HTML forms.  This patch attempts to fix that behavior by
introducing a JSONBoundField helper similar to the NestedBoundField
helper.

Improve books section