* lib/open-uri.rb (OpenURI.open_http): accept multiple certs path in
  ssl_ca_certs.

* tool/downloader.rb: use certs of rubygems for downloading gems.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48941 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* 2014-12-24

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48942 b2dd03c8-39d4-4d8f-98ff-823fe69b080e