Unable to read large response

``` php
$t = new Tarantool();

$data = str_repeat('x', 1024 * 1024);
$result = $t->eval('return ...', [$data]);

var_dump($data === $result[0]);
```

outputs

``` sh
Fatal error: Uncaught exception 'Exception' with message 'Can't read query from server'
```
