clarify names of `add` and `delete` subcommands

Add/remove sounds more natural than add/delete, but I’m not sure if it is just to me. If I’m not the only one, I guess having remove to alias internally to delete would be helpful

[leifwickland]

I agree that remove is the natural complement to add, analogous to create/delete. “Add” and “remove” suggest membership.

However, reading the docs, it appears that perhaps you don’t want membership.

[add] may be used to create new projects and modules respectively.

I’m tempted to offer a third opinion and say that it is add which should be changed to create and that delete is just fine. 😃

(Am I doing bikeshedding right?)

[ianp]

remove makes more sense to me, although personally I’d go with summon and banish 😈