It contains following changes from 3.0.0.beta1
* Preserve time zone offset when deserializing times
https://github.com/ruby/psych/pull/316
* Enable YAML serialization of Ruby delegators
https://github.com/ruby/psych/pull/158
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59101 b2dd03c8-39d4-4d8f-98ff-823fe69b080e