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.

Note that it's unnecessary to wrap inside of Foundation's closure: [FastClick already attaches itself to the `window`][1].

[1]: https://github.com/zurb/foundation/blob/15ff5249aff8a2ad13fc3fcce39c683424e793a1/js/vendor/fastclick.js#L760