* lib/rubygems:  Update to RubyGems 2.2.0.preview.1

  This brings several new features to RubyGems summarized here:

  https://github.com/rubygems/rubygems/blob/v2.2.0.preview.1/History.txt

* test/rubygems:  ditto.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42967 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* 2013-09-19

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42968 b2dd03c8-39d4-4d8f-98ff-823fe69b080e