Brasil campaign LP

- Uses Bowser for browser detection and uses classes on body to determine what to show and what to hide.
Simplified Gruntfile

- Only compiles a simple coffee file to a JavaScript file.
Optimized Brasil images
Was ignoring wrong folder
Added campaign-tracked URLs to page.

Used generated classes to show corresponding anchor depending if it's an up-to-date user, non-Firefox user or old-Firefox user.

This way was easier than generating the URLs with javascript.
Added Analytics and events
Content depends on language of page

If on english, last content section is the promo for the sidebar addon. If not, it's a promo to visit the Mozilla blog.