Update Foundation to 4.1.6

Downloaded from http://foundation.zurb.com/files/foundation-4.1.6.zip
Changelog: https://github.com/zurb/foundation/blob/v4.1.6/docs/CHANGELOG.md

I did not minify
* 4.1.6/css/normalize.css (normalize.css v2.1.1)
* all the 4.1.6/js/foundation/foundation.*.js
* 4.1.6/js/vendor/jquery.js & zepto.js, which are the same as 4.1.2 (using diff)

but foundation.min.js and foundation.min.css are there

Hopefully there will be the same auto-minification (by @Lockyc?) as for 4.1.2