'Downgraded' phpMyAdmin to 4.0.10.2

This fixes sentora/sentora-installers#10 (phpMyAdmin not working on CentOS) by using a phpMyAdmin version which supports MySQL 5+. The phpMyAdmin 4.0.x branch will be supported with security updates until 2017.

Discussion for staff can be found at http://forums.sentora.io/showthread.php?tid=151