anchor.diff:  ENV DOCKER_BUCKET get.docker.com
   ENV DOCKER_VERSION 1.11.1
   ENV DOCKER_SHA256 893e3c6e89c0cd2c5f1e51ea41bc2dd97f5e791fcfa3cee28445df277836339d
  +
   
   RUN set -x \
     && curl -fSL "https://${DOCKER_BUCKET}/builds/Linux/x86_64/docker-$DOCKER_VERSION.tgz" -o docker.tgz \
  
positive.code:   && docker -v
  
  # Copy the local code source
  # and tell docker this folder 
  # must be used when running a
  # container. 
  COPY . /app
  WORKDIR /app
  
  # Run the test to make sure 
  # the docker image will be ok.
  # If the test fails, the image 
  # will not be built
  RUN npm install && \
      # npm test && \
      # Then just install 
      # production node modules
      rm -rf ./node_modules && \
      npm install --production && \
  
negative.code: 
  # run the application
  CMD ["npm", "start"]
  EXPOSE 3000
  