# File lib/clockwork/manager.rb, line 48
    def every(period, job='unnamed', options={}, &block)
      if job.is_a?(Hash) and options.empty?
        options = job
        job = "unnamed"
      end
      if options[:at].respond_to?(:each)
        every_with_multiple_times(period, job, options, &block)
      else
        register(period, job, block, options)
      end
    end