Update mysqli.php

mysqli_query changed to $this->mysqli->set_charset("utf-8");
deleted $i=0 and $i++ in while loop to $data[] = $row
mysqli is_resource editing and adding some object to handle older actions
changing name of the mysqli class to handle zend server error.
statement variable was deleted. Maybe we can add it in the future for binding operations.
Merge pull request #722 from hkulekci/patch-1

Patch for mysqli driver