anchor.diff:  
   # Install npm and bower packages
   WORKDIR /home/app/tmp/vendor
  -RUN sudo -u app npm install && \
  +RUN /sbin/setuser app npm install && \
       npm install -g phantomjs-prebuilt
   
   # Install Ruby gems
  
positive.code:     mkdir -p /home/app/tmp/vendor/bundle && \
      chown -R app:app /home/app/tmp/vendor/bundle && \
      chmod -R 755 /home/app/tmp/vendor/bundle && \
      sudo -u app bundle install --path vendor/bundle
  
  # Copy webapp folder
  ADD . /home/app/webapp
  
negative.code: FROM phusion/passenger-full:0.9.19
  MAINTAINER Martin Fenner "mfenner@datacite.org"
  
  # Set correct environment variables.
  