NotImplemented is not an exception

`NotImplemented` is a singleton object, not an exception. You should be raising `NotImplementedError` here instead.

Fix timedelta JSON serialization on Python 2.6.

Preliminary Support For Django 1.8 Alpha

Save objects before assigning them in InheritedModelSerializationTests; Django 1.8 now throws an error when assigning unsaved objects to Foreign Key, GenericForeignKey, and OneToOneFields

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