* lib/rubygems:  Update to RubyGems 2.0.4.  See
  https://github.com/rubygems/rubygems/blob/2.0/History.txt for changes


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41843 b2dd03c8-39d4-4d8f-98ff-823fe69b080e