* from 1.9 require relative path from the file must use require_relative.
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test/rss/test_maker_1.0.rb, test/rss/test_maker_atom_feed.rb:
RSS 1.0 and Atom feed maker treat maker.channel.language as
maker.channel.dc_language.
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RSS::Maker.[] returns a maker class corresponds to passed version.
* test/rss/test_maker_*.rb: add tests for RSS::Maker.[].
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