Update libraries/joomla/cache/controller.php

Solving Strict standards issue in CMS
Update libraries/joomla/cache/controller/page.php
Update libraries/joomla/cache/controller/page.php
Update libraries/joomla/cache/controller.php
Update libraries/joomla/cache/controller/page.php
Merge pull request #1710 from infograf768/patch-7

cache strict standards issue when using system plugin cache in CMS