Adding option for persistent connections to DB class. Defaults to false to avoid a bug in PHP 5.4.
https://bugs.php.net/bug.php?id=63176
Updating Changelog.
Add: Catch and reconnect lost MySQL connections.
Merge branch 'dev' of https://github.com/nZEDb/nZEDb into nZEDb-dev

Conflicts:
	nzedb/build/nZEDb.xml

merge conflict
Merge branch 'nZEDb-dev' into dev