Release v0.0.6

This release includes the following changes:

• fix minor typo
• Remove the timeframe for v1 spec
• Export console New func
• setns: replace env with netlink for bootstrap data
• systemd: support cgroup parent with specified slice
• libcontainer: network_linux.go: fix go vet
• Fixing xattr test step issue
• libcontainer: configs: create cgroup_unsupported.go in order to build on darwin as well
• Fixing minor typo in usage
• setns: add bootstrap data
• Adding error conditions when apparmor disabled
• README.md: clarify OCI JSON files