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/push_command.rb

@@ -8,7 +8,13 @@ class Gem::Commands::PushCommand < Gem::Command
   include Gem::GemcutterUtilities
 
   def description # :nodoc:
-    'Push a gem up to RubyGems.org'
+    <<-EOF
+The push command uploads a gem to the push server (the default is
+https://rubygems.org) and adds it to the index.
+
+The gem can be removed from the index (but only the index) using the yank
+command.  For further discussion see the help for the yank command.
+    EOF
   end
 
   def arguments # :nodoc:
@@ -20,7 +26,7 @@ class Gem::Commands::PushCommand < Gem::Command
   end
 
   def initialize
-    super 'push', description, :host => self.host
+    super 'push', 'Push a gem up to the gem server', :host => self.host
 
     add_proxy_option
     add_key_option