Implement display of logs for docker:start (#8) and docker:log (#49)
Minor documentation fix
Documentation update
Documentation update
Documentation update
Rename docker:log --> docker:logs. Finally fixes #49
Changed semantic for port specifiaction when using properties

Instead of docker.ports.50000=8080 --> docker.ports.1=50000:8080 is used since
it fits better the docker semantics. Fixes #61