No longer using PHP for redirects or CDN resources

Thanks to mod_pagespeed for nginx

Signed-off-by: Mahmoud Al-Qudsi <mqudsi@neosmart.net>
Retina image loading support doesn't work with mod_pagespeed

It works by add @2x to the name of the image, mod_pagespeed
butchers the original file names so this doesn't work.

Signed-off-by: Mahmoud Al-Qudsi <mqudsi@neosmart.net>