'Adds steps to a jobflow
:type jobflow_id: str
:param jobflow_id: The job flow id
:type steps: list(boto.emr.Step)
:param steps: A list of steps to add to the job'

def add_jobflow_steps(self, jobflow_id, steps):

    if (not isinstance(steps, list)):
        steps = [steps]
    params = {}
    params['JobFlowId'] = jobflow_id
    step_args = [self._build_step_args(step) for step in steps]
    params.update(self._build_step_list(step_args))
    return self.get_object('AddJobFlowSteps', params, JobFlowStepList, verb='POST')
