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/html5.md

@@ -0,0 +1,38 @@
+Write a comment here
+*** Parameters: ***
+{} # params 
+*** Markdown input: ***
+ <div class="frame">
+ <a class="photo" href="http://www.flickr.com/photos/censi/88561568/" ><img moz-do-not-send="true" src="http://static.flickr.com/28/88561568_ab84d28245_m.jpg" width="240" height="180" alt="Aperitif" /></a>
+ </div>
+
+
+*** Output of inspect ***
+md_el(:document,[
+	md_html(" <div class=\"frame\">\n <a class=\"photo\" href=\"http://www.flickr.com/photos/censi/88561568/\" ><img moz-do-not-send=\"true\" src=\"http://static.flickr.com/28/88561568_ab84d28245_m.jpg\" width=\"240\" height=\"180\" alt=\"Aperitif\" /></a>\n </div>")
+],{},[])
+*** Output of to_html ***
+<div class='frame'>
+ <a href='http://www.flickr.com/photos/censi/88561568/' class='photo'><img src='http://static.flickr.com/28/88561568_ab84d28245_m.jpg' height='180' moz-do-not-send='true' alt='Aperitif' width='240' /></a>
+ </div>
+*** Output of to_latex ***
+
+*** Output of to_md ***
+
+*** Output of to_s ***
+
+*** EOF ***
+
+
+
+	OK!
+
+
+
+*** Output of Markdown.pl ***
+<p><div class="frame">
+ <a class="photo" href="http://www.flickr.com/photos/censi/88561568/" ><img moz-do-not-send="true" src="http://static.flickr.com/28/88561568_ab84d28245_m.jpg" width="240" height="180" alt="Aperitif" /></a>
+ </div></p>
+
+*** Output of Markdown.pl (parsed) ***
+Error: #<NoMethodError: private method `write_children' called for <div> ... </>:REXML::Element>