function cronSchedule( pkg ) {
	var mins = name2bucket( pkg, 60 );
	var hrs = name2bucket( pkg, 24 );
	var dow = name2bucket( pkg, 7 );
	return mins+' '+hrs+' * * '+dow;
}
Returns a cron schedule for a given package.

@private
@param {string} pkg - package name
@returns {string} cron schedule