def css_compressor=(compressor)
      if compressor.respond_to?(:to_sym)
        compressor = CSS_COMPRESSORS[compressor.to_sym]
      end
      Tilt.prefer compressor, 'css'
    end
def css_compressor=(compressor)
      if compressor.respond_to?(:to_sym)
        compressor = CSS_COMPRESSORS[compressor.to_sym]
      end
      Tilt.prefer compressor, 'css'
    end
Sets the CSS compressor to use. The compressor can
 be either a symbol mapping to the recognized Crush::Engines
 (see CSS_COMPRESSORS) or any Tilt::Template.

 @param [Tilt::Template, Symbol] compressor The compressor to use.