Add script/ci

Signed-off-by: Aanand Prasad <aanand.prasad@gmail.com>

script/test-versions

@@ -4,9 +4,6 @@
 
 set -e
 
->&2 echo "Validating DCO"
-script/validate-dco
-
 >&2 echo "Running lint checks"
 flake8 compose tests setup.py
 
@@ -18,7 +15,7 @@ fi
 
 for version in $DOCKER_VERSIONS; do
   >&2 echo "Running tests against Docker $version"
-  docker-1.5.0 run \
+  docker run \
     --rm \
     --privileged \
     --volume="/var/lib/docker" \