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/blanks_in_code.md

@@ -0,0 +1,106 @@
+Write a comment abouth the test here.
+*** Parameters: ***
+{}
+*** Markdown input: ***
+This block is composed of three lines:
+
+	one
+	
+	three
+
+This block is composed of 5
+
+	
+	one
+	
+	
+	four
+	
+
+This block is composed of 2
+
+	 
+	two
+
+
+
+*** Output of inspect ***
+md_el(:document,[
+	md_par(["This block is composed of three lines:"]),
+	md_el(:code,[],{:raw_code=>"one\n\nthree"},[]),
+	md_par(["This block is composed of 5"]),
+	md_el(:code,[],{:raw_code=>"one\n\n\nfour"},[]),
+	md_par(["This block is composed of 2"]),
+	md_el(:code,[],{:raw_code=>"two"},[])
+],{},[])
+*** Output of to_html ***
+<p>This block is composed of three lines:</p>
+
+<pre><code>one
+
+three</code></pre>
+
+<p>This block is composed of 5</p>
+
+<pre><code>one
+
+
+four</code></pre>
+
+<p>This block is composed of 2</p>
+
+<pre><code>two</code></pre>
+*** Output of to_latex ***
+This block is composed of three lines:
+
+\begin{verbatim}one
+
+three\end{verbatim}
+This block is composed of 5
+
+\begin{verbatim}one
+
+
+four\end{verbatim}
+This block is composed of 2
+
+\begin{verbatim}two\end{verbatim}
+*** Output of to_md ***
+This block is composed of three lines:
+
+This block is composed of 5
+
+This block is composed of 2
+*** Output of to_s ***
+This block is composed of three lines:This block is composed of 5This block is composed of 2
+*** EOF ***
+
+
+
+	OK!
+
+
+
+*** Output of Markdown.pl ***
+<p>This block is composed of three lines:</p>
+
+<pre><code>one
+
+three
+</code></pre>
+
+<p>This block is composed of 5</p>
+
+<pre><code>one
+
+
+four
+</code></pre>
+
+<p>This block is composed of 2</p>
+
+<pre><code>two
+</code></pre>
+
+*** Output of Markdown.pl (parsed) ***
+Error: #<NoMethodError: private method `write_children' called for <div> ... </>:REXML::Element>