Fixed #7441 - Improved the doctest OutputChecker to be more lenient with JSON an XML outputs. This is required so that output ordering that doesn't matter at a semantic level (such as the order of keys in a JSON dictionary, or attributes in an XML element) isn't caught as a test failure.  Thanks to Leo Soto for the patch.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@7981 bcc190cf-cafb-0310-a4f2-bffc1f526a37