fandrieu

As as follow-up to #24: the create_function has been [deprecated](http://php.net/manual/en/migration72.deprecated.php) in php 7.2. Would it be possible to update [Utils::createLambdaFromString](https://github.com/Athari/YaLinqo/blob/b73d46928ebaa6b2f46d3f1d2273ede4f6a98479/YaLinqo/Utils.php#L153) to avoid using that function ? Thanks