Fix formatter line number calc
Resume stdin before reading it in the CLI
Be a superset of CSS

For the benefits of:
- Using Roole merely as a CSS prefixer
- Importing other CSS frameworks to @extend selectors
- namespacing CSS frameworks with @module
Adding .roo only if no ext exists when importing a file

So importing foo.css won't end up importing foo.css.roo
Implement @charset
Refactor defaults.js
Bump minor version