Fixed Tracis-CI and docker-compose

Fixed .travis.yml

Author: Vincent Composieux

.travis.yml

@@ -1,15 +1,19 @@
 sudo: required
 
+env:
+  DOCKER_COMPOSE_VERSION: 1.4.2
+
 services:
   - docker
 
 before_install:
   - mkdir symfony
-  - curl -L https://github.com/docker/compose/releases/download/1.4.0/docker-compose-`uname -s`-`uname -m` > docker-compose
+  - sudo rm /usr/local/bin/docker-compose
+  - curl -L https://github.com/docker/compose/releases/download/${DOCKER_COMPOSE_VERSION}/docker-compose-`uname -s`-`uname -m` > docker-compose
   - chmod +x docker-compose
   - sudo mv docker-compose /usr/local/bin
-  - sudo iptables -N DOCKER # fix issue https://github.com/travis-ci/travis-ci/issues/4778
 
 script:
-  - docker-compose up
+  - docker-compose up -d
+  - docker-compose ps