Log Message:
memcached: updated to 1.5.12

Memcached 1.5.12

Overview
Single bugfix release. Fixes a refcount leak that could happen when attempting \ 
to run incr/decr against a:

* 0 byte value
* CHUNKED (> 512k) item
* extstore item that has been flushed to disk

Fixes
fix INCR/DECR refcount leak for invalid items