code: function (options) {
      // our default options
      this.options = _.extend({
          cssFile:   '',
          htmlFile:  '',
          selectors: [
              // '[^x]small',
              // 'h1'
              // 'large'
          ],
          propertiesExclude: [
              'animation[\-a-z]*', 'transition[\-a-z]*',
              'cursor', 'nav[\-a-z]*', 'resize',
              'image[\-a-z]*'
          ],
          includeFontFace: true,
          minifyCSS:       true,
          overwriteCSS:    true, // if already present
          showLog:         true
      }, options);
  
      return this;
  }
docs: init Basecss