What if the user specifies a different limit? 

We shouldn't be using a constant value to check if we need to query the server again. Instead, we should be checking if there might be more items to get from the server, like the we we do it [here](https://github.com/stormpath/stormpath-sdk-php/blob/master/src/Stormpath/Resource/PaginatedIterator.php#L90).