code: function bowerList(kind) {
  			return function(done) {
  				var params = _.extend({}, bowerOptions);
  				params[kind] = true;
  				bower.commands.list(params, {offline: true})
  					.on('error', grunt.fail.fatal.bind(grunt.fail))
  					.on('end', function(data) {
  						done(null, data);  // null means "no error" for async.parallel
  					});
  			};
  		}
docs: Returns function that invokes `list` command of Bower API.
  Should be used inside async.parallel.
  
  @param {String} kind map|paths
  @return {Function}