design for #207
tidy up, catch None in ports
partial implementation to return portmaps and images from ``IDockerClient.list``
IDockerClient.list() returns image and port information about a container
lint fix (whitespace in blank line)
patch code referencing #207 to make use of image from DockerClient.list()
revert local change to Vagrantfile that I didn't mean to commit
addresses review comment, removes None value for Application image
Merge pull request #878 from ClusterHQ/dockerclient-list-images-ports-207

Dockerclient list images ports 207