[1.0.X] Fixed #9555: respect the `feed_url` feed parameter. Thanks, sedden. Backport of r10432 from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.0.X@10433 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/contrib/syndication/feeds.py

@@ -23,13 +23,14 @@ class Feed(object):
     item_pubdate = None
     item_enclosure_url = None
     feed_type = feedgenerator.DefaultFeed
+    feed_url = None
     title_template = None
     description_template = None
 
     def __init__(self, slug, request):
         self.slug = slug
         self.request = request
-        self.feed_url = request.path
+        self.feed_url = self.feed_url or request.path
         self.title_template_name = self.title_template or ('feeds/%s_title.html' % slug)
         self.description_template_name = self.description_template or ('feeds/%s_description.html' % slug)