Fixed #3875 -- Added HttpResponseBadRequest. Thanks, Scott Barr.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@4866 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/http/__init__.py

@@ -272,6 +272,9 @@ class HttpResponsePermanentRedirect(HttpResponse):
 class HttpResponseNotModified(HttpResponse):
     status_code = 304
 
+class HttpResponseBadRequest(HttpResponse):
+    status_code = 400
+
 class HttpResponseNotFound(HttpResponse):
     status_code = 404