An option to respect Object.inspect()

The original `util.inspect` always looks wether an object has the
`inspect` property defined as a function. If it is, then it calls it and
prints the result instead of the literal representation.

Classes like `Buffer` have `inspect` defined so when you do:

``` js
console.log( { some: Buffer(2) } )
```

you get:

```
{ some: }
```

I think `eyes` should respect this, or at least have an option to
do so. The style applied should be the `other` style, since what
`inspect` returns is often not a literal representation.