Version 3

- Add SUIT-style utility classes
- Remove global state styles
- Update module modifier class example to use multiple classes rather than extends
- Update box-sizing default to use a nice, [more overwritable](http://css-tricks.com/inheriting-box-sizing-probably-slightly-better-best-practice/) method
- Split global config variables up into separate files
- Split font-face at-rules up into a file per font, and add an example
- Bump version