Upgrade to Foundation 5.3.0 and added kitchen sink

Hey there, this is a big pull request so please review and let me know what you think. So what's in it?

* Copied over all of the 5.3 SASS files
* Copied over all of the 5.3 JS files and updated the import to use `this` instead of `window`. I was going by what you had before so let me know if they are correct. I tested the plugins using Kitchen Sink and didn't encounter any errors
* Added a Kitchen Sink template. You can now create a poor man's style guide for your application with `{{> kitchensink}}`. This file could use some cleaning up but figured this is a good start.
* Added instructions for using `_settings.scss` in a project
* Consolidated `api.use` on the client side