enabled docker

Author: fehguy

.travis.yml

@@ -1,5 +1,10 @@
-sudo: false
+sudo: required
 language: java
-script: mvn verify -Psamples
 jdk:
   - oraclejdk7
+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
+env:
+  - DOCKER_IMAGE_NAME=swaggerapi/swagger-generator