Update Tools.php

Change timezone selector to use php DateTimeZone::listIdentifiers instead of hard coded list.

Info here: http://www.php.net/manual/en/datetimezone.listidentifiers.php
Update Tools.php

Corrected error.
Update Standard.php

Updated the default timezone to be the sever's default.
Update Standard.php

Undo
Merge pull request #194 from skyhook19/patch-1

Change timezone selection options from hardcoded list to use php