centralized pygments aliases into pygments_code.rb. Added alias for .ru (ruby), which sort of fixes #108

plugins/pygments_code.rb

@@ -7,6 +7,10 @@ FileUtils.mkdir_p(PYGMENTS_CACHE_DIR)
 
 module HighlightCode
   def highlight(str, lang)
+    lang = 'ruby' if lang == 'ru'
+    lang = 'objc' if lang == 'm'
+    lang = 'perl' if lang == 'pl'
+    lang = 'yaml' if lang == 'yml'
     str = pygments(str, lang).match(/<pre>(.+)<\/pre>/m)[1].to_s.gsub(/ *$/, '') #strip out divs <div class="highlight">
     tableize_code(str, lang)
   end