validation and validation which disregard order of elements.
* test/rss/test_parser.rb: added tests for RSS 0.9x/2.0
validation.
* test/rss/{test_trackback,rss-testcase}.rb: fixed no good method
name.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@6590 b2dd03c8-39d4-4d8f-98ff-823fe69b080e