Upgrade to Foundation 5

First try : Foundation 4 -> Foundation 5

## Depedencies
 * Install foundation : `gem install zurb-foundation`
 * Install bower : http://bower.io/#installing-bower
 * go to `resrc/assets`
 * install packages with `bower install`

## Tips
 * if you have custom theme from javascript library, put it in `assets/js-custom-themes/library-name/my-theme.css`