Ruby

• ext/psych/emitter.c: output strings are automatically transcoded
• test/psych/test_emitter.rb: supporting tests
• test/psych/test_encoding.rb: more supporting tests

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@27910 b2dd03c8-39d4-4d8f-98ff-823fe69b080e