Adds -o (output dir) option to the build.sh
Adds -o (output dir) option to the build.sh

Other changes:

  * adds usage message
  * copies logs to an output dir
  * removes build type from a Dockerfile name because we are
    using different directories instead

Signed-off-by: Eugene Zamriy <9ca3a9f70b33e046bab2e2acccb982c72f85783a@zamriy.info>

srbala/docker-images