Merge branch 'master' into bug/2918-null-operations

.travis.yml

@@ -32,7 +32,7 @@ after_success:
       docker build -t $DOCKER_IMAGE_NAME .;
       if [ ! -z "$TRAVIS_TAG" ]; then
         docker tag $DOCKER_IMAGE_NAME $DOCKER_IMAGE_NAME:$DOCKER_IMAGE_TAG;
-        docker push $DOCKER_IMAGE_NAME $DOCKER_IMAGE_NAME:$DOCKER_IMAGE_TAG;
+        docker push $DOCKER_IMAGE_NAME:$DOCKER_IMAGE_TAG;
         docker tag $DOCKER_IMAGE_NAME $DOCKER_IMAGE_NAME:latest;
         docker push $DOCKER_IMAGE_NAME:latest;
       else