command callback should not decrement active query count.
command callback should not decrement active query count.

Starefossen/memcached,jolks/node-memcached,XadillaX/node-memcached,3rd-Eden/node-memcached,Starefossen/memcached,3rd-Eden/node-memcached,mbrukman/node-memcache-client,andrewbrereton/memcached,jolks/node-memcached,fouber/node-memcached,jkrems/memcached,3rd-Eden/memcached,XadillaX/node-memcached,jkrems/memcached,mgetz/memcached,mgetz/memcached,mrlannigan/memcached,fouber/node-memcached,mbrukman/node-memcache-client,mrlannigan/memcached,kbarbounakis/memcached,3rd-Eden/memcached,kbarbounakis/memcached,andrewbrereton/memcached,acarrasco/node-memcached,acarrasco/node-memcached