Fixed #10907, #14190 and #15829 -- Pass item to sitemaps template to allow...

Fixed #10907, #14190 and #15829 -- Pass item to sitemaps template to allow further customization like Google News enabled sitemaps. Thanks, manfre and lakinwecker.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@16474 bcc190cf-cafb-0310-a4f2-bffc1f526a37