Fix the tests on 1.3 and HEAD

In the latest Django master code, RequestFactory.put behaves fundamentally differently than it did pre-1.5.  By default, it expects an octet string as opposed to a dictionary that it will encode like a multipart form.  So, for 1.5 and on, we have to be explicit about the multipart type and pre-encode the data.  However, pre-1.5 Django expects a dictionary if the content type is multipart.  So, the cleanest thing to do is explicitly handle the versions independently.

djangorestframework/tests/request.py

@@ -4,7 +4,6 @@ Tests for content parsing, and form-overloaded content parsing.
 from django.conf.urls.defaults import patterns
 from django.contrib.auth.models import User
 from django.test import TestCase, Client
-from django.test.client import MULTIPART_CONTENT, BOUNDARY, encode_multipart
 
 from djangorestframework import status
 from djangorestframework.authentication import SessionAuthentication
@@ -95,8 +94,16 @@ class TestContentParsing(TestCase):
         """
         data = {'qwerty': 'uiop'}
         parsers = (FormParser, MultiPartParser)
+
+        from django import VERSION
+
+        if VERSION >= (1, 5):
+            from django.test.client import MULTIPART_CONTENT, BOUNDARY, encode_multipart
             request = factory.put('/', encode_multipart(BOUNDARY, data), parsers=parsers,
                                   content_type=MULTIPART_CONTENT)
+        else:
+            request = factory.put('/', data, parsers=parsers)
+
         self.assertEqual(request.DATA.items(), data.items())
 
     def test_standard_behaviour_determines_non_form_content_PUT(self):