rename class to `CLIRB` and suggest namespacing

Referencing `CLI` from the global namespace might be dangerous as
it is so generic (other things might define their own CLI classes).

This renames it to the more explicit `CLIRB` and suggests namespacing
it to help avoid these cases.
Merge pull request #4 from redding/kr-tweak

rename class to `CLIRB` and suggest namespacing