REXML is dead. Long live Nokogiri.

Modify Maruku to use Nokogiri instead of REXML.
Produces a 3-fold speedup in the #to_html method.

vendor/plugins/maruku/spec/block_docs/pending/amps.md

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+Write a comment here
+*** Parameters: ***
+{} # params 
+*** Markdown input: ***
+	@articles.map(&:title)
+*** Output of inspect ***
+md_el(:document,[md_el(:code,[],{:raw_code=>"@articles.map(&:title)"},[])],{},[])
+*** Output of to_html ***
+<pre><code>@articles.map(&amp;:title)</code></pre>
+*** Output of to_latex ***
+\begin{verbatim}@articles.map(&:title)\end{verbatim}
+*** Output of to_md ***
+
+*** Output of to_s ***
+

vendor/plugins/maruku/spec/block_docs/pending/empty_cells.md

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+Write a comment here
+*** Parameters: ***
+{} # params 
+*** Markdown input: ***
+|    | 1  | 2  |
+|----|----|----|
+|  A | X  |    |
+|  B |    | X  |
+*** Output of inspect ***
+md_el(:document,[
+	md_el(:table,[
+		md_el(:head_cell,[],{},[]),
+		md_el(:head_cell,["1"],{},[]),
+		md_el(:head_cell,["2"],{},[]),
+		md_el(:cell,["A"],{},[]),
+		md_el(:cell,["X"],{},[]),
+		md_el(:cell,[],{},[]),
+		md_el(:cell,["B"],{},[]),
+		md_el(:cell,[],{},[]),
+		md_el(:cell,["X"],{},[])
+	],{:align=>[:left, :left, :left]},[])
+],{},[])
+*** Output of to_html ***
+<table><thead><tr><th/><th>1</th><th>2</th></tr></thead><tbody><tr><td style="text-align: left;">A</td><td style="text-align: left;">X</td><td style="text-align: left;"/>
+</tr><tr><td style="text-align: left;">B</td><td style="text-align: left;"/><td style="text-align: left;">X</td>
+</tr></tbody></table>
+*** Output of to_latex ***
+\begin{tabular}{l|l|l}
+&1&2\\
+\hline 
+A&X&\\
+B&&X\\
+\end{tabular}
+*** Output of to_md ***
+12AXBX
+*** Output of to_s ***
+12AXBX

vendor/plugins/maruku/spec/block_docs/pending/link.md

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+Write a comment here
+*** Parameters: ***
+{} # params 
+*** Markdown input: ***
+<http://www.aa.com>
+
+ <http://www.bb.com>
+
+  <http://www.cc.com>
+
+   <http://www.dd.com>
+
+    <http://www.dd.com>
+
+<a@invalid.it>
+
+ <a@invalid.it>
+
+   <a@invalid.it>
+
+    <a@invalid.it>
+*** Output of inspect ***
+md_el(:document,[
+	md_par([md_url("http://www.aa.com")]),
+	md_par([md_url("http://www.bb.com")]),
+	md_par([md_url("http://www.cc.com")]),
+	md_par([md_url("http://www.dd.com")]),
+	md_el(:code,[],{:raw_code=>"<http://www.dd.com>"},[]),
+	md_par([md_email("a@invalid.it")]),
+	md_par([md_email("a@invalid.it")]),
+	md_par([md_email("a@invalid.it")]),
+	md_el(:code,[],{:raw_code=>"<a@invalid.it>"},[])
+],{},[])
+*** Output of to_html ***
+<p><a href="http://www.aa.com">http://www.aa.com</a></p>
+
+<p><a href="http://www.bb.com">http://www.bb.com</a></p>
+
+<p><a href="http://www.cc.com">http://www.cc.com</a></p>
+
+<p><a href="http://www.dd.com">http://www.dd.com</a></p>
+
+<pre><code>&lt;http://www.dd.com&gt;</code></pre>
+
+<p><a href="mailto:a@invalid.it">&#097;&#064;&#105;&#110;&#118;&#097;&#108;&#105;&#100;&#046;&#105;&#116;</a></p>
+
+<p><a href="mailto:a@invalid.it">&#097;&#064;&#105;&#110;&#118;&#097;&#108;&#105;&#100;&#046;&#105;&#116;</a></p>
+
+<p><a href="mailto:a@invalid.it">&#097;&#064;&#105;&#110;&#118;&#097;&#108;&#105;&#100;&#046;&#105;&#116;</a></p>
+
+<pre><code>&lt;a@invalid.it&gt;</code></pre>
+*** Output of to_latex ***
+\href{http://www.aa.com}{http\char58\char47\char47www\char46aa\char46com}
+
+\href{http://www.bb.com}{http\char58\char47\char47www\char46bb\char46com}
+
+\href{http://www.cc.com}{http\char58\char47\char47www\char46cc\char46com}
+
+\href{http://www.dd.com}{http\char58\char47\char47www\char46dd\char46com}
+
+\begin{verbatim}<http://www.dd.com>\end{verbatim}
+\href{mailto:a@invalid.it}{a\char64invalid\char46it}
+
+\href{mailto:a@invalid.it}{a\char64invalid\char46it}
+
+\href{mailto:a@invalid.it}{a\char64invalid\char46it}
+
+\begin{verbatim}<a@invalid.it>\end{verbatim}
+*** Output of to_md ***
+
+*** Output of to_s ***
+

vendor/plugins/maruku/spec/block_docs/pending/ref.md

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+Write a comment here
+*** Parameters: ***
+{} # params 
+*** Markdown input: ***
+[a. b] is a link.
+
+[a. b]: http://site.com/
+
+*** Output of inspect ***
+md_el(:document,[
+	md_par([md_link(["a. b"],"a_b"), " is a link."]),
+	md_ref_def("a_b", "http://site.com/", {:title=>nil})
+],{},[])
+*** Output of to_html ***
+<p><a href="http://site.com/">a. b</a> is a link.</p>
+*** Output of to_latex ***
+\href{http://site.com/}{a. b} is a link.
+*** Output of to_md ***
+a. bis a link.
+*** Output of to_s ***
+a. b is a link.