Decouple FastClick from Foundation

The commit removes the minified FastClick library currently embedded in Foundation, includes FastClick during the standard, minified build, and promotes the inclusion of the vendorized script in custom configurations:

```html
<script src="/js/vendor/fastclick.js"></script>
```

Note that it's unnecessary to wrap inside of Foundation's closure as is currently the case: [FastClick already attaches itself to the `window`][1].

[1]: https://github.com/zurb/foundation/blob/15ff5249aff8a2ad13fc3fcce39c683424e793a1/js/vendor/fastclick.js#L760