Merge pull request #12 from nikicat/master

fixed bumpversion parsing, refactored --showdiff output, speed up commands
Bump version: version='0.3' → 0.4
settings.yaml: filtered out urllib3.connectionpool log messages
setup.py: depend on docker-py >= 0.3.2 instead of git version
refactored inspect_image workaround
load_python: call function "create" by default
actions.stop: check that container is running before stop