fix: action is Array or Dictionary can't be transformed

[relax-yy]

When action is Array or Dictionary, it's hard to transformed to NSArray or NSDictionary.

"items": [
     "action": {
        "id": 1,
        "name: "book name"
    },
    "type": 1"
]

the TangramBus's event params get action is

{
    id = 1;
    name = "book name";
}

While we want

 {
        "id": 1,
        "name: "book name"
 }

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