[Proposal] Route Model Bindings

I am currently working on adding support for Route Model Bindings which at the moment looks like this.

``` bash
php artisan api:generate --routePrefix=v1 --router=dingo --bindings="company,1|language,1|taxrate,1"
```

This would get transformed into an array with `[company => 1, language => 1, taxrate => 1]`.

Would this syntax for adding the bindings fine or would another way be preferred?
