Test for serialization of an unconfigured StartContainerCmd,
documentation
Merge pull request #112 from albers/empty-start-command

Test for serialization of an unconfigured StartContainerCmd
Add tests for StartContainerCmd.withVolumesFrom()
Failing test for CreateContainerCmd.withVolumesFrom()
Pull up shared assertion
[WIP] Try to fix CreateContainerCmdImpl.withVolumesFrom

Turns out that this does not work even in Docker.