Add new docker images

Add tomcat container, jetty tag and self-builded docker file

.travis.yml

@@ -11,6 +11,13 @@ script:
 after_success:
   - docker login  -u $DOCKER_LOGIN -p $DOCKER_PASSWORD
   - if [ "$TRAVIS_BRANCH" == "master" ]; then
-    docker build -t plantuml/plantuml-server:latest . ;
+
+    docker image build -t plantuml/plantuml-server:jetty -f Dockerfile.jetty . ;
+    docker image build -t plantuml/plantuml-server:tomcat -f Dockerfile.tomcat . ;
+    docker image tag plantuml/plantuml-server:jetty plantuml/plantuml-server:latest ;
+
+    docker push plantuml/plantuml-server:tomcat;
+    docker push plantuml/plantuml-server:jetty;
     docker push plantuml/plantuml-server:latest;
+
     fi