Update to latest HTML5lib, Add Maruku testdir

Sync with the latest html5lib.
Having the Maruku unit tests on-hand may be useful for debugging; so let's include them.

vendor/plugins/maruku/tests/math/use_itex.rb

@@ -0,0 +1,34 @@
+
+# run this as:
+# ruby -I../../lib use_itex.rb < private.txt
+
+require 'maruku'
+
+module MaRuKu; module Out; module HTML
+	
+	def to_html_inline_math_itex
+		# You can: either return a REXML::Element
+		#    return Element.new 'div'    
+		# or return an empty array on error
+		#    return []  
+		# or have a string parsed by REXML:
+		tex = self.math
+		tex.gsub!('&','&amp;')
+		mathml = "<code>#{tex}</code>"
+		return Document.new(mathml).root
+	end
+	
+	def to_html_equation_itex
+		return to_html_inline_math_itex
+	end
+
+end end end
+
+MaRuKu::Globals[:html_math_engine] = 'itex'
+
+doc = Maruku.new($stdin.read, {:on_error => :raise})
+
+File.open('output.xhtml','w') do |f|
+	f.puts doc.to_html_document
+end
+