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/unittest/math/math2.md

@@ -0,0 +1,74 @@
+
+*** Parameters: ***
+require 'maruku/ext/math'
+{:math_numbered => ['\\['], :html_math_engine => 'itex2mml' }
+*** Markdown input: ***
+
+\[
+	\alpha
+\]
+
+\begin{equation}
+	\alpha
+\end{equation}
+
+\begin{equation} \beta
+\end{equation}
+
+
+\begin{equation} \gamma \end{equation}
+*** Output of inspect ***
+md_el(:document,[
+	md_el(:equation,[],{:label=>"eq1",:math=>"\t\\alpha\n\n",:num=>1},[]),
+	md_el(:equation,[],{:label=>nil,:math=>"\t\\alpha\n\n",:num=>nil},[]),
+	md_el(:equation,[],{:label=>nil,:math=>" \\beta\n",:num=>nil},[]),
+	md_el(:equation,[],{:label=>nil,:math=>" \\gamma ",:num=>nil},[])
+],{},[])
+*** Output of to_html ***
+<div class='maruku-equation' id='eq:eq1'><span class='maruku-eq-number'>(1)</span><math class='maruku-mathml' display='block' xmlns='http://www.w3.org/1998/Math/MathML'><mi>&alpha;</mi></math><div class='maruku-eq-tex'><code style='display: none'>	\alpha
+
+</code></div></div><div class='maruku-equation'><math class='maruku-mathml' display='block' xmlns='http://www.w3.org/1998/Math/MathML'><mi>&alpha;</mi></math><div class='maruku-eq-tex'><code style='display: none'>	\alpha
+
+</code></div></div><div class='maruku-equation'><math class='maruku-mathml' display='block' xmlns='http://www.w3.org/1998/Math/MathML'><mi>&beta;</mi></math><div class='maruku-eq-tex'><code style='display: none'> \beta
+</code></div></div><div class='maruku-equation'><math class='maruku-mathml' display='block' xmlns='http://www.w3.org/1998/Math/MathML'><mi>&gamma;</mi></math><div class='maruku-eq-tex'><code style='display: none'> \gamma </code></div></div>
+*** Output of to_latex ***
+\begin{equation}
+\alpha
+\label{eq1}\end{equation}
+\begin{displaymath}
+\alpha
+\end{displaymath}
+\begin{displaymath}
+\beta
+\end{displaymath}
+\begin{displaymath}
+\gamma
+\end{displaymath}
+*** Output of to_md ***
+
+*** Output of to_s ***
+
+*** EOF ***
+
+
+
+	OK!
+
+
+
+*** Output of Markdown.pl ***
+<p>[
+    \alpha
+]</p>
+
+<p>\begin{equation}
+    \alpha
+\end{equation}</p>
+
+<p>\begin{equation} \beta
+\end{equation}</p>
+
+<p>\begin{equation} \gamma \end{equation}</p>
+
+*** Output of Markdown.pl (parsed) ***
+Error: #<NoMethodError: private method `write_children' called for <div> ... </>:REXML::Element>