Fix Unicode bug

Fix Diego Restrepo's bug (see Rev 184).
Update to latest HTML5lib.

vendor/plugins/HTML5lib/test/test_encoding.rb

@@ -0,0 +1,35 @@
+require File.join(File.dirname(__FILE__), 'preamble')
+
+require 'html5/inputstream'
+
+class Html5EncodingTestCase < Test::Unit::TestCase
+  include HTML5
+  include TestSupport
+
+  begin
+    require 'rubygems'
+    require 'UniversalDetector'
+
+    def test_chardet #TODO: can we get rid of this?
+      file = File.open(File.join(TESTDATA_DIR, 'encoding', 'chardet', 'test_big5.txt'), 'r')
+      stream = HTML5::HTMLInputStream.new(file, :chardet => true)
+      assert_equal 'big5', stream.char_encoding.downcase
+    rescue LoadError
+      puts "chardet not found, skipping chardet tests"
+    end
+  end
+
+  html5_test_files('encoding').each do |test_file|        
+    test_name = File.basename(test_file).sub('.dat', '').tr('-', '')
+
+    TestData.new(test_file, %w(data encoding)).
+      each_with_index do |(input, encoding), index|
+
+      define_method 'test_%s_%d' % [ test_name, index + 1 ] do
+        stream = HTML5::HTMLInputStream.new(input, :chardet => false)
+        assert_equal encoding.downcase, stream.char_encoding.downcase, input
+      end
+    end
+  end
+
+end