add shellspec golden harness for the legacy make engine

- spec/golden/cases.txt: 69 black-box cases (CLI wrapper mode and make
  include mode) run in a hermetic sandbox with a mocked docker
- spec/golden/expected/*.txt recorded from this engine (baseline)
- make test / test-golden / golden-record / lint dev targets

spec/fixtures/host-project/stack/host/registrator.yml

@@ -0,0 +1,9 @@
+services:
+  registrator:
+    image: gliderlabs/registrator:master
+    container_name: ${HOST_COMPOSE_PROJECT_NAME:-localhost}-registrator
+    network_mode: host
+    depends_on: [consul]
+    command: -internal=false -useIpFromLabel SERVICE_ADDRESS consul://127.0.0.1:8500
+    volumes:
+      - ${DOCKER_SOCKET_LOCATION:-/var/run/docker.sock}:/tmp/docker.sock