package.json: add more keywords
Upgrade debug and node-sass

debug: use stderr rather than stdout for logging
Upgrade mocha
autoprefixer: change version specifier
Prefixes: use autoprefixer-core
Merge pull request #70 from macbre/update-dependencies

Upgrade npm dependencies
extractColors: introduce a helper function + tests
Add tests
colors: add a rule (#68)
colors: add to README
Merge pull request #71 from macbre/colors

Number of unique colors used in CSS
js-beautify: add as dev dependency
Add .jsbeautifyrc
package.json: add "npm run-script beautify"
Run js-beautify
Upgrade to autoprefixer-core v4.0.0

Only -webkit-box-decoration-break is required
Merge pull request #72 from macbre/jsbeautify

Introduce js-beautify
Merge pull request #73 from macbre/autoprefixer-core-4.0.0

Upgrade to autoprefixer-core v4.0.0
Set user agent

Resolves #75
Merge pull request #76 from macbre/user-agent

Set user agent