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/lists7b.md

@@ -0,0 +1,136 @@
+Test case given by Scott.
+
+http://rubyforge.org/tracker/index.php?func=detail&aid=8862&group_id=2795&atid=10735
+
+a should not be indented.
+
+*** Parameters: ***
+{} # params 
+*** Markdown input: ***
+* a
+  * a1
+  * a2
+* b
+
+
+*** Output of inspect ***
+md_el(:document,[
+	md_el(:ul,[
+		md_el(:li,[
+			"a",
+			md_el(:ul,[
+				md_el(:li_span,["a1"],{:want_my_paragraph=>false},[]),
+				md_el(:li_span,["a2"],{:want_my_paragraph=>false},[])
+			],{},[])
+		],{:want_my_paragraph=>true},[]),
+		md_el(:li,[md_par(["b"])],{:want_my_paragraph=>false},[])
+	],{},[])
+],{},[])
+*** Output of to_html ***
+<ul>
+<li>
+a
+
+<ul>
+<li>a1</li>
+
+<li>a2</li>
+</ul>
+</li>
+
+<li>
+<p>b</p>
+</li>
+</ul>
+*** Output of to_latex ***
+\begin{itemize}%
+\item a
+
+\begin{itemize}%
+\item a1
+\item a2
+
+\end{itemize}
+
+\item b
+
+
+
+\end{itemize}
+*** Output of to_md ***
+-* a1
+* a2
+-
+*** Output of to_s ***
+aa1a2b
+*** EOF ***
+
+
+
+
+Failed tests:   [:inspect, :to_html] 
+
+*** Output of inspect ***
+-----| WARNING | -----
+md_el(:document,[
+	md_el(:ul,[
+		md_el(:li,[
+			md_par(["a"]),
+			md_el(:ul,[
+				md_el(:li_span,["a1"],{:want_my_paragraph=>false},[]),
+				md_el(:li_span,["a2"],{:want_my_paragraph=>false},[])
+			],{},[])
+		],{:want_my_paragraph=>true},[]),
+		md_el(:li,[md_par(["b"])],{:want_my_paragraph=>false},[])
+	],{},[])
+],{},[])
+*** Output of to_html ***
+-----| WARNING | -----
+<ul>
+<li>
+<p>a</p>
+
+<ul>
+<li>a1</li>
+
+<li>a2</li>
+</ul>
+</li>
+
+<li>
+<p>b</p>
+</li>
+</ul>
+*** Output of to_latex ***
+\begin{itemize}%
+\item a
+
+\begin{itemize}%
+\item a1
+\item a2
+
+\end{itemize}
+
+\item b
+
+
+
+\end{itemize}
+*** Output of to_md ***
+-* a1
+* a2
+-
+*** Output of to_s ***
+aa1a2b
+*** Output of Markdown.pl ***
+<ul>
+<li>a
+<ul>
+<li>a1</li>
+<li>a2</li>
+</ul></li>
+<li>b</li>
+</ul>
+
+*** Output of Markdown.pl (parsed) ***
+Error: #<NoMethodError: private method `write_children' called for <div> ... </>:REXML::Element>