Multi-command

:wave:

From ur blog:

> Supporting multiple commands as multiple functions

Curious how you'd think about structuring this? Something like this?

```js
/**
* top-level help here
*/
module.exports = {
/**
* one command's help
*/
commandA: function(a, b, c) { ... },
/**
* another command's help
*/
commandB: function(a, b, c) { ... }
}
```

Would this then support:

```
cli --help
cli commandA --help
cli commandB --help
```

Could the nesting go into deeper sub-commands?