* lib/csv.rb: Remove the dangerous serialization feature.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39077 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* doc/security.rdoc: Remove documentation for unsafe CSV.load which
  was deleted in r39077


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39078 b2dd03c8-39d4-4d8f-98ff-823fe69b080e