Add working --help option to deploy environment and deploy display
running r10k deploy environment --help previously attempted to deploy rather than showing help
consequently, there was no documentation internally for the commonly-used -p option
Switch to help command approach
Depends on pull request #25 on ddfreyne/cri to allow subcommands to have help run on them
Update cri dependency to 2.5.0 for multi level subcommand help support
Update help examples to use help subcommand rather than --help
Merge pull request #93 from danieldreier/add_deploy_help

Add working --help option to deploy environment and deploy display