Any plan to support Bracket-notated child or children

Hi, I found you work only support '.' to get child, is there any plan to support '[]'?

``` go
var pathDelimiter = "."
```

Such like that: 
> JsonPath expressions can use the dot–notation
$.store.book[0].title
or the bracket–notation
$['store']['book'][0]['title']

https://github.com/json-path/JsonPath
