\Phalcon\Mvc\Collection::count() returns an array like \Phalcon\Mvc\Collection::find() does

As documents said, we could use Phalcon\Mvc\Collection::count() like this:

``` php
public static array count ([array $parameters])
```

Perform a count over a collection

``` php
<?php
 echo 'There are ', Robots::count(), ' robots';
```

But actually, it's return is just like \Phalcon\Mvc\Collection::find() .

bug?
