Restored disabled markup-engine configuration (ref: 616bf52).

It's not clear to me why this line was commented out, as the commit message says only "whitespace", referring to the removal of extraneous white space from another part of the file. Was it an accident? (e.g., commented out for testing and checked in unintentionally)

lib/showoff.rb

@@ -80,7 +80,7 @@ def initialize(app=nil)
     @asset_path = "./"
 
     # Initialize Markdown Configuration
-    #MarkdownConfig::setup(settings.pres_dir)
+    MarkdownConfig::setup(settings.pres_dir)
   end
 
   def self.pres_dir_current