code: public Iteration iteration(String name, Schedule schedule,
                                 DateTime beginDate, DateTime endDate) {
          return iteration(name, schedule, beginDate, endDate, null);
      }
docs: Create a new iteration with a name, begin date, and end date.
  
  @param name      The name of the iteration.
  @param schedule  The schedule this iteration belongs to.
  @param beginDate The begin date or start date of this iteration.
  @param endDate   The end date of this iteration.
  @return A newly minted Iteration that exists in the VersionOne system.