Temp fix to rubygems-1.3.7 URL while the package isn't online at prod…

…uction.cf.rubygems.org.

rubygems.rb

@@ -59,7 +59,7 @@
   merge :versions, :rubygems => '1.3.7'
   met? { provided? %w[gem ruby] }
   meet {
-    handle_source "http://production.cf.rubygems.org/rubygems/rubygems-#{var(:versions)[:rubygems]}.tgz" do
+    handle_source "http://rubyforge.org/frs/download.php/70696/rubygems-1.3.7.tgz" do
       shell "ruby setup.rb", :sudo => !File.writable?(which('ruby'))
     end
   }