updated to enable docker

Author: fehguy

.travis.yml

@@ -2,11 +2,16 @@ sudo: required
 language: java
 jdk:
   - oraclejdk7
+services:
+  - docker
+before_install:
+  # required when sudo: required for the Ruby petstore tests
+  - gem install bundler
+install:
+  - docker login --email=$DOCKER_HUB_EMAIL --username=$DOCKER_HUB_USERNAME --password=$DOCKER_HUB_PASSWORD
 script:
   - mvn verify -Psamples
   - docker build -t $DOCKER_IMAGE_NAME ./modules/swagger-generator
   - if [ ! -z "$TRAVIS_TAG" ]; then docker tag $DOCKER_IMAGE_NAME:latest $DOCKER_IMAGE_NAME:$TRAVIS_TAG; fi && docker push $DOCKER_IMAGE_NAME
-before_install:
-  - gem install bundler
 env:
   - DOCKER_IMAGE_NAME=swaggerapi/swagger-generator