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Reduce the size of Docker image

Matthias Käppler requested to merge github/fork/kfei/docker/reduce-image-size into master

Created by: kfei

  1. Add --no-install-recommends option to apt-get install, this avoids lots of (~30MB) unnecessary packages.
  2. Add ca-certificates package for wget fetching stuffs from Amazon S3.
  3. There is no need to run apt-get clean for an image derived from official Ubuntu since they already cleaned (see also: http://goo.gl/B2SQRB) all the garbages produced by apt-get.

Signed-off-by: kfei kfei@kfei.net

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