Initial commit of Gitlab CLI shell. Tab completion for Gitlab.actions.
Fix output_table call in CLI.
Adding online help for Gitlab::Shell using "ri" command.  I'm unsure if this is the best idea.  Some refactoring still needs to be done to remove duplicate code.
Handling some error cases when calling for help.
Merge pull request #57 from asedge/gitlab_shell

Initial commit of Gitlab CLI shell. Tab completion for commands.