RewriteEngine On
RewriteBase /

RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)/$ /$1 [L,R=301]

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php [L]

<IfModule mod_headers.c>
   # WEEK
   <FilesMatch "\.(jpg|jpeg|png|gif|swf)$">
       Header set Cache-Control "max-age=604800, public"
   </FilesMatch>

   # WEEK
   <FilesMatch "\.(js|css|swf)$">
       Header set Cache-Control "max-age=604800"
   </FilesMatch>
</IfModule>