MB-7250:  sign at project level:

CODE_SIGN_IDENTITY   = "3rd Party Mac Developer Application: Couchbase, Inc. (N2Q372V7W2)";
PROVISIONING_PROFILE = "3B464580-5CE0-4BF8-B3E0-7D0F892408B8";

Change-Id: I58faa7a507a8fecdc03eb2ab6b48e984c9841759
Reviewed-on: http://review.couchbase.org/28798
Reviewed-by: Philip Labee <philip@couchbase.com>
Tested-by: Philip Labee <philip@couchbase.com>