Add CMakeLists to build gometa along with Couchbase server

Change-Id: I15a73d855443dc1e9c9c2bbaa9a1eefca216cc87
Reviewed-on: http://review.couchbase.org/43596
Reviewed-by: Chris Hillery <ceej@couchbase.com>
Tested-by: Sarath Lakshman <sarath@couchbase.com>