Use docker:1.7 image to match CircleCI's version

circle.yml

@@ -15,9 +15,9 @@ dependencies:
     - docker pull python:3
     - docker pull rancher/socat-docker
     - docker pull appropriate/curl
-    - docker pull docker
+    - docker pull docker:1.7
 
 test:
   override:
     - docker build -t jwilder/nginx-proxy:bats .
-    - bats test
+    - bats test

test/lib/docker_helpers.bash

@@ -56,5 +56,5 @@ function docker_tcp {
 		--expose 2375 \
 		-v /var/run/docker.sock:/var/run/docker.sock \
 		rancher/socat-docker
-	docker run --link "$container_name:docker" docker version
+	docker run --link "$container_name:docker" docker:1.7 version
 }