Fixing bug: as Memcache::get() accepts $flags by reference and sets value to it in some cases there could be incorrect value in $this->flag and future \Cache\Drivers\Memcache::save() calls after firs \Cache\Drivers\Memcache::load() failed.
Merge pull request #3 from iborodikhin/master

Fix bug: after first Memcache::load() further calls to Memcache::save() failed...