1. Migrated /slide/ to use framework

2. Fixed CSS not being applied on /slide/
3. Minor changes to /code/ to reuse code which is also used on /slide/

customize.dist/translations/messages.js

@@ -166,6 +166,7 @@ define(function () {
     out.slideOptionsText = "Options";
     out.slideOptionsTitle = "Customize your slides";
     out.slideOptionsButton = "Save (enter)";
+    out.slide_invalidLess = "Invalid custom style";
 
     out.languageButton = "Language";
     out.languageButtonTitle = "Select the language to use for the syntax highlighting";