added docker-py to requirements
minion does not wait forever for members to become activei now
implemented docker_image parameter check
some code formatting according to flake8
some code formatting according to flake8
removed docker-py as dependency
Merge branch 'master' into launch_improvements
Merge branch 'master' into launch_improvements
try to autodetect configuration
trivial test for context
Merge pull request #3 from zalando/launch_improvements

Launch improvements
minor doctests
minor doctests[A
another test
cloud-init log is displayed when an error occurrs while exection 'minion ver create...'
extract methods
test create_version
cleanup
fixed and refurbished cloud-init log functionality
merged