Fix link to `django-rest-framework-filters`

`django-rest-framework-chain`)

Fix for FileUploadParser with 3.x

Fix ident format when using HTTP_X_FORWARDED_FOR

If NUM_PROXIES setting is set to None,
HTTP_X_FORWARDED_FOR might be used as is, which
might contain spaces and cause errors on
cache backends like memcached.

Fix broken links in README

Output from parsers ends up in a Django MergeDict and they exists elements to be dicts - not None

Tweaked a few issues in the tutorial documentation.

Release 3.0.3

Add the link to the 3.0.3 milestone.

Mark Django REST Framework as incompatible with eggs

fixed doc : DEFAULT_AUTHENTICATION_CLASSES -> DEFAULT_AUTHENTICATION

+ It is consistent with docs about DEFAULT_PERMISSION_CLASSES

Fix compatibility comment regarding OrderedDict

Closes #2355.

Normally a serializer won't need these arguments on __init__, but
if a user has customized __init__ they may expect them to be available.

fix the serializer widget style formatting documentation

First pass at refactoring get_field_info in utils.model_meta