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

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