Ruby

merges r31317 from trunk into ruby_1_9_2.¶

• ext/psych/parser.c (parse): strings from psych have proper taint
  markings.
• test/psych/test_tainted.rb: test for string taint

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_2@31812 b2dd03c8-39d4-4d8f-98ff-823fe69b080e