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/code.md

@@ -0,0 +1,34 @@
+Comment
+*** Parameters: ***
+{}
+*** Markdown input: ***
+Here is an example of AppleScript:
+
+    tell application "Foo"
+        beep
+    end tell
+    	tab
+
+*** Output of inspect ***
+md_el(:document,[
+	md_par(["Here is an example of AppleScript:"]),
+	md_el(:code,[],{:raw_code=>"tell application \"Foo\"\n    beep\nend tell\n\ttab"},[])
+],{},[])
+*** Output of to_html ***
+<p>Here is an example of AppleScript:</p>
+
+<pre><code>tell application "Foo"
+    beep
+end tell
+	tab</code></pre>
+*** Output of to_latex ***
+Here is an example of AppleScript:
+
+\begin{verbatim}tell application "Foo"
+    beep
+end tell
+	tab\end{verbatim}
+*** Output of to_md ***
+Here is an example of AppleScript:
+*** Output of to_s ***
+Here is an example of AppleScript: