V15 bundle handling

TODO

• Add metadata to input/res in scoring step

# from v1.5 compute worker
prog_status = {
    'exitCode': exit_code,
    'ingestionExitCode': ingestion_program_exit_code,
    'elapsedTime': elapsedTime
}

...

with open(join(output_dir, 'metadata'), 'w') as f:
    f.write(yaml.dump(prog_status, default_flow_style=False))

• Since we're saving scoring step output/ now, add Trello task for that