Updated global.inc.php to reflect the new values required for cookie configuration and documented each of the options.
Changed the Cookie Explanation in global.inc.php to be more in line with the rest of the structure.
In order to read the cookie configuration from include/config/globa.inc.php the session must begin after this has been included.
Pull cookie session params from include/config/global.inc.php before session_start()
When destroying a users session on the server we now also remove all session data immediately, rather than relying on garbage collection, and we destroy the cookie on the users browser.
Added note about php.ini session.gc_maxlifetime value - Important to stop garbage collection removing cookies that should be valid.
Merge pull request #445 from IainKay/issue-434

Issue 434