Replaced diff.rb with xhtmldiff.rb, which (unlike its predecessor) produces well-formed redline documents.

lib/diff/lcs/array.rb

@@ -0,0 +1,21 @@
+#! /usr/env/bin ruby
+#--
+# Copyright 2004 Austin Ziegler <diff-lcs@halostatue.ca>
+#   adapted from:
+#     Algorithm::Diff (Perl) by Ned Konz <perl@bike-nomad.com>
+#     Smalltalk by Mario I. Wolczko <mario@wolczko.com>
+#   implements McIlroy-Hunt diff algorithm
+#
+# This program is free software. It may be redistributed and/or modified under
+# the terms of the GPL version 2 (or later), the Perl Artistic licence, or the
+# Ruby licence.
+# 
+# $Id: array.rb,v 1.3 2004/08/08 20:33:09 austin Exp $
+#++
+# Includes Diff::LCS into the Array built-in class.
+
+require 'diff/lcs'
+
+class Array
+  include Diff::LCS
+end