New feature: Able to pass specific Docker HTTP version. The DSL is: docker_http_version.
Revert "New feature: Able to pass specific Docker HTTP version. The DSL is: docker_http_version."

This reverts commit d52c7b7edf98c931247c5359aa97dba88a73eaca.
Generate default cidfile as part of host_config
cidfile is optional and deploy.rake sets default to ‘/etc/cidfile’
Merge pull request #24 from didip/add-cidfile

Automatically add cidfile when starting a container.