Custom separator for `formatMessage`

``` javascript
Globalize.loadMessages({
pt: {
greetings: {
hello: "Olá",
bye: "Tchau"
}
}
});

Globalize( "pt" ).formatMessage( "greetings/hello" );
```
This works great, but I want to use dot (`.`) instead if `/` as path navigation separator. **How can I set custom separator symbol?**

I know, that I can do something like
``` javascript
Globalize.loadMessages({
pt: {
"greetings.hello": "Olá",
"greetings.bye": "Tchau"
}
});
```
But it's not good solution.