updated css files and color scheme

-switched from simpLESS.app to less.app (better less compiler)
-moved less files to /core/CSS/LESS
-updated 'help' 'code' and 'pre' styles with new pink color theme
-added 'code-box' module similar to 'example' and 'demo' mods
-changes to quoteblock and caption elements
-minor margin changes to headings