Update .gitignore to ignore .DS_Store files
Update .gitignore to ignore .DS_Store files

Change-Id: Ib8d02c19f6a650e6e2a20127c075816b049e8a6c
Reviewed-on: http://review.couchbase.org/58773
Reviewed-by: Eben Haber <d1abc94d70526bfcf3e4b0ce727cb9a6fbb52a3a@couchbase.com>
Tested-by: Michael Wiederhold <a17fed27eaa842282862ff7c1b9c8395a26ac320@couchbase.com>

couchbase/couchbase-cli,couchbase/couchbase-cli