merge "Newer Root CA for rubygems.org" for rubygems 2.2 bundled with ruby 2.1 (r48389)
rubygems bundled CA Root files perhaps have to be updated.
related issue: https://github.com/rubygems/rubygems/issues/1050
The patch for rubygems 2.2 branch is here: https://github.com/rubygems/rubygems/commit/17d8922966051864a0c4bf768623e9d0c854de26
The related commit for trunk: http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?revision=48389&view=revision