Update LoggingMemcache.php

Removed forward_static_call_array in get method (2.1.0) due to it not sending arguments by reference. 

This (at the very least) breaks unit testing extensions on it.

This is probably required in a lot of other locations as well.
Fix for session handler overriding

This fixes a bug where setting a session.handler_id in your symfony
configuration didn't work, due to this bundle overriding it.

The setting is now only overridden if the handler_id is not null.
Merge branch 'master' into cheeky_solution
Reference parameter to ->get() fixed
Reference parameter to ->getByKey() fixed
Reference parameter to ->getMulti() fixed
Reference parameter to ->getMultiByKey() fixed
More surety that calls contains the correct function name added
Merge branch 'master' of https://github.com/LeaseWeb/LswMemcacheBundle
Merge pull request #26 from jasperstafleu/master

Update LoggingMemcache.php
Added a simple test case and added support for HHVM (version: 2.2.0b1)
Renamed test to be not executed by phpunit
Merged upstream/master.