* lib/rubygems*: Updated to RubyGems 2.0

* test/rubygems*:  ditto.

* common.mk (prelude):  Updated for RubyGems 2.0 source rearrangement.

* tool/change_maker.rb:  Allow invalid UTF-8 characters in source
  files.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@37976 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/rubygems/commands/mirror_command.rb

@@ -0,0 +1,17 @@
+require 'rubygems/command'
+
+class Gem::Commands::MirrorCommand < Gem::Command
+  def initialize
+    super('mirror', 'Mirror all gem files (requires rubygems-mirror)')
+    begin
+      Gem::Specification.find_by_name('rubygems-mirror').activate
+    rescue Gem::LoadError
+      # no-op
+    end
+  end
+
+  def execute
+    alert_error "Install the rubygems-mirror gem for the mirror command"
+  end
+
+end