Fix Unicode bug

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

lib/chunks/chunk.rb

@@ -9,6 +9,10 @@ require 'uri/common'
 module Chunk
   class Abstract
 
+# Rails's default utf-8 support causes problems here. So, for Chunk::Abstract class, turn off
+# multibyte character support.
+    $KCODE = 'iso-8859-1'
+
     # automatically construct the array of derivatives of Chunk::Abstract
     @derivatives = []