Order by Raw bindings

[hashstudio]

For the following use:

$query->orderBy(QB::raw('my_table.state = ?', ['success']));

[cdvrooman]

Shouldn't the $orderBindings and $bindings variables be initialized as array() instead of [] to maintain compatibility with PHP 5.3?

[TCB13]

@hashstudio please fix the compatibility issue @cdvrooman noticed and add some unit tests. Thank you.