Add a Haml::Util module to stable.

lib/haml.rb

@@ -1053,4 +1053,5 @@ module Haml
   end
 end
 
+require 'haml/util'
 require 'haml/engine'

lib/haml/util.rb

@@ -0,0 +1,5 @@
+module Haml
+  module Util
+    class << self; include Haml::Util; end
+  end
+end