factored out ruby material into it's own file and added disqus commen…

…ting partial

source/content/_disqus.html.haml

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+#disqus_thread
+:javascript
+  /* * * CONFIGURATION VARIABLES: EDIT BEFORE PASTING INTO YOUR WEBPAGE * * */
+  var disqus_shortname = 'rubymacros'; // required: replace example with your forum shortname
+  var disqus_developer = 1;
+
+  /* * * DON'T EDIT BELOW THIS LINE * * */
+  (function() {
+      var dsq = document.createElement('script'); dsq.type = 'text/javascript'; dsq.async = true;
+      dsq.src = 'http://' + disqus_shortname + '.disqus.com/embed.js';
+      (document.getElementsByTagName('head')[0] || document.getElementsByTagName('body')[0]).appendChild(dsq);
+  })();
+%noscript
+  Please enable JavaScript to view the
+  %a{:href => "http://disqus.com/?ref_noscript"} comments powered by Disqus.
+%a.dsq-brlink{:href => "http://disqus.com"}
+  blog comments powered by
+  %span.logo-disqus Disqus

source/content/_ruby.html.md

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+
+### The state of the Ruby
+
+From the Pickaxe (4th ed., p. 378), we have macros defined as 
+Ruby methods which generate code "behind the scenes" by 
+turning small bits of code into larger bits of code.
+
+(Add more bits here, briefly summarizing without going into much
+detail.)
+