[ALOY-1276] Alloy's deepExtend is broken

Since [this commit](https://github.com/appcelerator/alloy/commit/84c9470d9932a5ad762f8220db79802d91ec4c86), the deepExtend() method present in Alloy is broken, as deeply merged properties get overwritten three line below. The method should not state:

    target[name] = deepExtend(deep, clone, copy);
}

target[name] = copy;

but:

    target[name] = deepExtend(deep, clone, copy);
} else {
    target[name] = copy;
}

As a consequence, this method is purely useless.