Updated scripts and scss to 4.3.2

- Updated scripts and scss from 4.0 to 4.3.2 (from https://github.com/zurb/foundation/tree/scss-standalone)
- Changed package.json version from 0.3.3 to 0.3.4
- Changed package.json description to add Foundation version number: "Yeoman generator for Zurb Foundation 4.3.2"