docs(third-party-resources): added `cookiecutter-django-rest` to misc third party resources

Replaced all dict and set conversions from lists to dict and set literals

Missing the `source=` keyword for the URLField parameter

Map TextField max_length to CharField

removed south migrations

Various typo/grammar fixes

fix typo for adding jquery string in AdminRenderer

Update versioning.md

Changed settings attribute 'VERSION_PARAMETER' --> to 'VERSION_PARAM'.

Update compat.py

try to import guardian if it's in INSTALLED_APPS

Fix codecov on Travis CI

The coverage report needs to be explicitly created with arguments passed
in to pytest-cov

Added django-rest-framework-social-oauth2 to list of third party packages

Use serializers.ValidationError in AuthTokenSerializer

Small doc typo `throttles` --> `throttling`

Per django rest framework docs, and to prevent confusion with Django's ValidationError, `serializers.ValidationError` is preferred to `exceptions.ValidationError`.

Added drf-haystack to third party resources

Fixed minor doc typo.

Added JSONField.

Remove content overriding