add_queue

Add a new queue to the scheduler.

@param Scheduler::Queue - name of the queue has to be unique

@return success - 0 @return error - error string

remove_queue

Remove a queue from scheduling

@param string - name of the queue to be removed

@return success - 0 @return error - error string

update_queue

Update the time entry of the given queue

@param string - name of the queue

@return success - 0