Update mysqli.php

mysqli_query changed to $this->mysqli->set_charset("utf-8");
deleted $i=0 and $i++ in while loop to $data[] = $row
Changed data/demo to catalog demo as per commit 6092447a22ac17dbb307339f0aa33a1b42ea36b0
<changed the directory image/data to image/catalog>
mysqli is_resource editing and adding some object to handle older actions
changing name of the mysqli class to handle zend server error.
Merge pull request #716 from robinflyhigh/master

Changed the directory image/data to image/catalog SQL Update
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