add docker as provider
initial commit for docker driver
fix list images and nodes for docker
on docker containers show create date in human format
add ex_start/stop functions for docker
fix https and http basic auth for docker
remove list locations from docker driver
add create node for docker
Fix unresolved references in docker.py create_node
Add payload param in docker ex_start_node
Make size var optional in docker create_node
Add search_images in docker driver
Add show_all param in docker list_nodes
Make optional param show_all in docker list_nodes boolean
Add docker get_logs to fetch the output of containers
Add self.api_version at DockerNodeDriver init
Get logs of a docker running container as string
Add docker pull image functionality
add doc strings, include more node metadata for containers, fix reboot container, return NodeImage on search/pull images
fix pull image and create container to use it if creation has failed