Allow arrays with viewData in Response

[weblee]

Allow arrays with viewData as per the docs :-)

[njoguamos]

I support this PR. I had opened an issue regarding fo the same .

[georgehanson]

This could probably be simplified without foreach. The following would also work:

if (is_array($key)) {
    $this->viewData = array_merge($this->viewData, $key);
} else {
    $this->viewData[$key] = $value;
}

return $this;

In my opinion it is more readable.

[njoguamos]

@georgehanson I agree with you, it is more readable

[reinink]

Hey thanks @weblee. Apparently I implemented this (1f0a6f6). Thanks either way!