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/table2.md

@@ -0,0 +1,60 @@
+Write a comment here
+*** Parameters: ***
+{}
+*** Markdown input: ***
+
+  Symbol    | Meaning | comments
+------------|---------|---------
+{:r} α | The first | I like it.
+{:r} ℵ | The first | I like it.
+
+
+{:r: scope='row'}
+*** Output of inspect ***
+md_el(:document,[
+	md_el(:table,[
+		md_el(:head_cell,["Symbol"],{},[]),
+		md_el(:head_cell,["Meaning"],{},[]),
+		md_el(:head_cell,["comments"],{},[]),
+		md_el(:cell,[" ", md_entity("alpha")],{},[[:ref, "r"]]),
+		md_el(:cell,["The first"],{},[]),
+		md_el(:cell,["I like it."],{},[]),
+		md_el(:cell,[" ", md_entity("aleph")],{},[[:ref, "r"]]),
+		md_el(:cell,["The first"],{},[]),
+		md_el(:cell,["I like it."],{},[])
+	],{:align=>[:left, :left, :left]},[]),
+	md_el(:ald,[],{:ald=>[["scope", "row"]],:ald_id=>"r"},[])
+],{},[])
+*** Output of to_html ***
+<table><thead><tr><th>Symbol</th><th>Meaning</th><th>comments</th></tr></thead><tbody><tr><th scope='row' style='text-align: left;'> &#945;</th><td style='text-align: left;'>The first</td><td style='text-align: left;'>I like it.</td>
+</tr><tr><th scope='row' style='text-align: left;'> &aleph;</th><td style='text-align: left;'>The first</td><td style='text-align: left;'>I like it.</td>
+</tr></tbody></table>
+*** Output of to_latex ***
+\begin{tabular}{l|l|l}
+Symbol&Meaning&comments\\
+\hline 
+ $\alpha${}&The first&I like it.\\
+ &The first&I like it.\\
+\end{tabular}
+*** Output of to_md ***
+SymbolMeaningcomments The firstI like it. The firstI like it.
+*** Output of to_s ***
+SymbolMeaningcomments The firstI like it. The firstI like it.
+*** EOF ***
+
+
+
+	OK!
+
+
+
+*** Output of Markdown.pl ***
+<p>Symbol    | Meaning | comments
+------------|---------|---------
+{:r} &alpha; | The first | I like it.
+{:r} &aleph; | The first | I like it.</p>
+
+<p>{:r: scope='row'}</p>
+
+*** Output of Markdown.pl (parsed) ***
+Error: #<NoMethodError: private method `write_children' called for <div> ... </>:REXML::Element>