Revert r42938 "* lib/rubygems: Update to RubyGems 2.1.3"

It breaks build.
20130913T200302Z.diff.html.gz

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42941 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/rubygems/commands/owner_command.rb

@@ -7,7 +7,14 @@ class Gem::Commands::OwnerCommand < Gem::Command
   include Gem::GemcutterUtilities
 
   def description # :nodoc:
-    'Manage gem owners on RubyGems.org.'
+    <<-EOF
+The owner command lets you add and remove owners of a gem on a push
+server (the default is https://rubygems.org).
+
+The owner of a gem has the permission to push new versions, yank existing
+versions or edit the HTML page of the gem.  Be careful of who you give push
+permission to.
+    EOF
   end
 
   def arguments # :nodoc:
@@ -19,7 +26,7 @@ class Gem::Commands::OwnerCommand < Gem::Command
   end
 
   def initialize
-    super 'owner', description
+    super 'owner', 'Manage gem owners of a gem on the push server'
     add_proxy_option
     add_key_option
     defaults.merge! :add => [], :remove => []
@@ -31,9 +38,15 @@ class Gem::Commands::OwnerCommand < Gem::Command
     add_option '-r', '--remove EMAIL', 'Remove an owner' do |value, options|
       options[:remove] << value
     end
+
+    add_option '-h', '--host HOST', 'Use another gemcutter-compatible host' do |value, options|
+      options[:host] = value
+    end
   end
 
   def execute
+    @host = options[:host]
+
     sign_in
     name = get_one_gem_name