Fixed #2713 -- Made the name of the sitemap view a parameter of the sitemap...

Fixed #2713 -- Made the name of the sitemap view a parameter of the sitemap index view, in order to allow decorators. Also cleaned up code in the area and removed redundant comments from the tests.


git-svn-id: http://code.djangoproject.com/svn/django/trunk@17408 bcc190cf-cafb-0310-a4f2-bffc1f526a37