Fix Mime::Type#to_sym to do @string.to_sym. Add text/yaml as alias for Mime::YAML
Fix Mime::Type#to_sym to do @string.to_sym. Add text/yaml as alias for Mime::YAML


git-svn-id: afc9fed30c1a09d8801d1e4fbe6e01c29c67d11f@3873 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

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