V4

# New
- Rewritten from the ground up with Rework
- Updated modular architecture with NPM
- Design principles
- More powerful breakpoint-based grid system
- Better default color styles
- Removed nav and responsive type (to be replaced with NPM modules)

## To do
- [x] Update README
- [x] Using Rework docs
- [x] Gulp recipe
- [x] Update Guide
- [x] Sassify task