CBD-1384:  use Xcode 5 to migrate XIB file

Change-Id: Id31e8287532c445931bd772070af32527f87bf6f
Reviewed-on: http://review.couchbase.org/37656
Reviewed-by: Philip Labee <philip@couchbase.com>
Tested-by: Philip Labee <philip@couchbase.com>