get_image: use "latest" tag by default
feature: port mappings, added image_ports function
output only first 7 symbols of container id
feature: place data volumes to "datavolumedir" by default
added --namespace option to override Docker repo namespace
added Image entity, "command" Container field, colored "status" output
actions: pep8 fix
fixed structlog initialization
actions.run: added "dockerurl" option
actions.status: added default (None) value for "ship" function arg
__init__.py: pep8 fix
__init__.py: export Image
added tests
actions.run: removed deprecated "--pull" option
added pylint checking
Merge pull request #6 from nikicat/master

port mapping, datavolumedir, tests, small fixes