* lib/yaml.rb: nodoc EngineManager, add History doc #8344


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40547 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* 2013-05-02

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40548 b2dd03c8-39d4-4d8f-98ff-823fe69b080e