Add suport urlparams nested

```javaScript
Alloy.createCollection('iten').fetch({
	wait: true,
	urlparams: {
	  parameters: {
	    field: 'field_product_iten',
	    item_id: [12, 10, 15]
	  }
	}
});

url output

//?parameters[field_name]=field_product_iten&parameters[item_id][0]=12&parameters[item_id][1]=10&parameters[item_id][2]=15
```