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Fix test_with_content_type_args to pass regardless of JSON library idiosyncracies

Fixes #78.

Support both staticfiles and ADMIN_MEDIA_PREFIX styles.

Added an additional attribute `unknown_form_fields` to `FormResource` 

Add get_queryset method to ListModelMixin. 

This can be easily re-implemented in a view, to allow the user to take
such things as request.user into account when creating the queryset.

If the attribute is set to `True`, the validation method will not
raise an `ErrorResponse` with status 400 but silently strip out
unexpected fields on the form and only return the validated data.

in py27)