Upgrade node & grunt buildbox (#3208)

.travis.yml

@@ -16,7 +16,7 @@ script:
   - docker run --rm -v $(pwd):/app jekkos/composer composer install
   - docker run --rm -v $(pwd):/app jekkos/composer php bin/install.php translations develop
   - sed -i "s/'\(dev\)'/'$rev'/g" application/config/config.php
-  - docker run --rm -it -v $(pwd):/app -w /app digitallyseamless/nodejs-bower-grunt
+  - docker run --rm -it -v $(pwd):/app -w /app opensourcepos/node-grunt-bower
     sh -c "npm install && bower install && grunt package"
   - docker build . --target ospos -t ospos
   - docker-compose -f docker-compose.test.yml up --abort-on-container-exit