Convert all ArrayObjects to native arrays [Trying to solve broken down migrations]

[thomseddon]

Hey,

Migration resets/rollbacks don't seem to work with this library, the suspect parts in Larvel are Migrator->rollback and Migrator->runDown

As you can see, rollback casts each migration to an object before passing to runDown, which then tries to access the object property. As php-rql returns ArrayObject's, this access fails.

This change is a bit hacky but converts ArrayObjects to native arrays!

Questions:

• Has anybody else found down/rollback migrations to be broken?
• Any idea why ArrayObject is used? (I have an issue open with php-rql)
• Is there a better approach?

Thanks!

[thomseddon]

Following up on this, the laravel-mongodb project specifically requests that documents be returned as native arrays here, so by returning an ArrayObject this project does have a different behaviour.

I've open danielmewes/php-rql#137 to see if php-rql fancy supporting something like this, in the interim this PR does fix the behaviour.