rocker-compose remove volumes if dependant container re-creates, Docker 1.9

[valch85]

[ybogdanov]

Same problem as grammarly/rocker#51

containers:
  a:
    volumes: /data
  b:
    volumes_from: a

When b changes, rocker-compose will remove and create the container. While removing b, Docker 1.9 removes the /data volume of a.