1.1.15 release.
SecurityManager adjustments
Updated changelog, upgrade, added option to disable keys validation, added back automatic key generation
Fixed accidental removal
Removed missing key test
Fixes #3636: Upgraded jQuery UI to 1.11.2
Merge branch '1.1.16-branch'

Conflicts:
	CHANGELOG
	UPGRADE
	framework/YiiBase.php
	framework/yiilite.php