Updated scripts to 4.3.2

Hey bauschan,

Really nice work on your generator-zurb-foundation repo. 

I noticed the Zurb files were using 4.0.0 so I wanted to upgrade them to 4.3.2. I gem installed the Sass Version of Foundation (http://foundation.zurb.com/docs/sass.html) and simply copied over the scripts from that folder to my fork of your repo.

I didn't touch the Sass files because your repo has a different file structure than the Zurb gem. For example, here is Zurb's sass folder:

- _normalize.scss
- _settings.scss
- app.scss

...whereas your repo's app/styles folder contains the following:

- foundation.scss
- normalize.scss
- /foundation
- /foundation/_variables.scss
- /foundation/components
- /foundation/components/_alert-boxes.scss (etc.)

Where did you download all of these scss files from? Would you be open to the idea of removing everything in the /styles folder and replacing it with the contents of Zurb's /sass folder for easier upgrading in the future?

Looking forward to hearing your thoughts about the scss files. Hoping this merge is helpful.

Thanks.