This extension uses libmemcached library to provide API for communicating with
memcached servers.

memcached is a high-performance, distributed memory object caching system,
generic in nature, but intended for use in speeding up dynamic web applications
by alleviating database load.

Resources
---------
 libmemcached:
   http://tangent.org/552/libmemcached.html

 memcached:
   http://www.danga.com/memcached/
