* 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

tool/change_maker.rb

@@ -3,7 +3,9 @@
 def diff2index(cmd, *argv)
   lines = []
   path = nil
-  `#{cmd} #{argv.join(" ")}`.split(/\n/).each do |line|
+  output = `#{cmd} #{argv.join(" ")}`
+  output.force_encoding Encoding::BINARY
+  output.each_line do |line|
     case line
     when /^Index: (\S*)/, /^diff --git [a-z]\/(\S*) [a-z]\/\1/
       path = $1