Add Memcached cookbook - To install ( and startup )

Change-Id: I272da70447b246ec3fe38d2a6bc9a03dfd6e2b2c
Reviewed-on: http://review.couchbase.org/27300
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Tommie McAfee <tommie@couchbase.com>