Add npm-less-plugin-clean-css a www/lesc tool pluggin and its dependencies
www/npm-less-plugin-clean-css: Compresses the css output from less using clean-css
` devel/npm-clean-css: Fast and efficient CSS optimizer for node.js and the Web
` devel/npm-source-map: Parse and consume source maps | ` devel/npm-amdefine: Implementation of AMD's define() in Node ` devel/npm-commander: node.js command-line interfaces made easy ` devel/npm-graceful-readlink: Graceful fs.readlink