code: function(config, env) {
  		return env.grunt.util._.extend({
  			banner: '',
  			compress: {
  				warnings: false
  			},
  			mangle: {},
  			beautify: false,
  			report: false
  		}, env.task.options(config.uglify || {}));
  	}
docs: Returns config for UglifyJS
  @param {Objecy} config Current config
  @param {Objecy} env    Task environment (`grunt` and `task` properties)
  @return {Object}