fix CircleCI docker API version mismatch

circle.yml

machine:
  pre:
    - |
      sudo curl -L -o /usr/bin/docker 'http://s3-external-1.amazonaws.com/circle-downloads/docker-1.8.2-circleci'
      sudo chmod 0755 /usr/bin/docker
      sudo service docker start

dependencies:
  override:
    - sudo pip install -U docker-compose==1.4.2
#    - curl -L https://github.com/docker/compose/releases/download/1.4.2/docker-compose-`uname -s`-`uname -m` > /usr/local/bin/docker-compose
#    - chmod +x /usr/local/bin/docker-compose