Merge pull request MoOx#14 from jonathantneal/feature/nesting

Add PostCSS Nesting

Fixed: plugin can be consumed correctly from es5 environment (2.0.1)

[email protected]

Fixed: `compress` option now works again correctly (1.8.4)

Close MoOx#195
Close MoOx#194

1.8.3 (some `url` option fixes)

Docs: make tools/plugins on "Setup" page a bit more visible