Session Dostroy compatible with Phalcon 1.3

From Phalcon 1.3 Phalcon\Session\AdapterInterface is compatible with SessionHandlerIterface so to works with 1.3.0 destroy method must have parameter $session_id
Fix memcache destory for Phalcon 1.3.0
Update Mongo:destroy() for Phalcon 1.3.0
Merge pull request #147 from nexik/patch-1

Session Dostroy compatible with Phalcon 1.3