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/syntax_hl.md

@@ -0,0 +1,52 @@
+Write a comment abouth the test here.
+*** Parameters: ***
+{}
+*** Markdown input: ***
+This is ruby code:
+
+	require 'maruku'
+	
+	puts Maruku.new($stdin).to_html
+
+This is ruby code:
+
+	require 'maruku'
+{: lang=ruby html_use_syntax}
+	
+	puts Maruku.new($stdin).to_html
+*** Output of inspect ***
+md_el(:document,[
+	md_par(["This is ruby code:"]),
+	md_el(:code,[],{:raw_code=>"require 'maruku'\n\nputs Maruku.new($stdin).to_html"},[]),
+	md_par(["This is ruby code:"]),
+	md_el(:code,[],{:raw_code=>"require 'maruku'"},[["lang", "ruby"], [:ref, "html_use_syntax"]]),
+	md_el(:code,[],{:raw_code=>"puts Maruku.new($stdin).to_html"},[])
+],{},[])
+*** Output of to_html ***
+<p>This is ruby code:</p>
+
+<pre><code>require 'maruku'
+
+puts Maruku.new($stdin).to_html</code></pre>
+
+<p>This is ruby code:</p>
+
+<pre class="ruby"><code lang="ruby"><span class="ident">require</span> <span class="punct">'</span><span class="string">maruku</span><span class="punct">'</span></code></pre>
+
+<pre><code>puts Maruku.new($stdin).to_html</code></pre>
+*** Output of to_latex ***
+This is ruby code:
+
+\begin{verbatim}require 'maruku'
+
+puts Maruku.new($stdin).to_html\end{verbatim}
+This is ruby code:
+
+\begin{verbatim}require 'maruku'\end{verbatim}
+\begin{verbatim}puts Maruku.new($stdin).to_html\end{verbatim}
+*** Output of to_md ***
+This is ruby code:
+
+This is ruby code:
+*** Output of to_s ***
+This is ruby code:This is ruby code: