Split Docker install and login/pull/build into install and `before_…

…script` sections. Remove unnecessary information-only commands.

.travis.yml

@@ -1,9 +1,11 @@
 sudo: required
 
+language: python
+
 services:
   - docker
 
-before_install:
+install:
   # Update apt sources. See: https://docs.docker.com/engine/installation/linux/ubuntulinux/
   - sudo apt-key adv --keyserver hkp://p80.pool.sks-keyservers.net:80 --recv-keys 58118E89F3A912897C070ADBF76221572C52609D
   - echo 'deb https://apt.dockerproject.org/repo ubuntu-trusty main' | sudo tee /etc/apt/sources.list.d/docker.list
@@ -16,18 +18,15 @@ before_install:
   - curl -L https://github.com/docker/compose/releases/download/1.7.0/docker-compose-`uname -s`-`uname -m` | sudo tee /usr/local/bin/docker-compose > /dev/null
   - sudo chmod +x /usr/local/bin/docker-compose
 
-  # Login and build images.
+before_script:
   - docker login -e="$DOCKER_EMAIL" -u="$DOCKER_USERNAME" -p="$DOCKER_PASSWORD"
   - docker pull "interaction/icekit:${TAG}" || true
   - docker build -t "interaction/icekit:${TAG}" .
-  - docker-compose -f docker-compose.travis.yml config
 
 script:
   - docker-compose -f docker-compose.travis.yml run --rm django
 
 after_success:
-  - docker history "interaction/icekit:${TAG}"
-  - docker images
   - docker push "interaction/icekit:${TAG}"
 
 env: