Prepare for 0.0.12-beta

Change-Id: Ia2ca2611abd3288ef00a4c33c6e2239788fee1dc
Reviewed-on: http://review.couchbase.org/25855
Reviewed-by: Trond Norbye <trond.norbye@gmail.com>
Tested-by: Trond Norbye <trond.norbye@gmail.com>