Include args with prefix

Under this rule, $0 = generator and $1 = name and other args are handled as parameters.

Like this

```
{
  "files": [
    {
      "from": "foo.coffee.hbs",
      "to": "generators/{{name}}/{{$2}}-{{$3}}.coffee.hbs"
    }
  ]
}
```

```
$ scaffolt mygenerator foo p2 p3
```

Code is a bit dirty but anyway this project looks be needed to be refactored someday.