anchor.diff:  
   WORKDIR ${NODE_HOME}
   
  -RUN npm ${NPM_LOGLEVEL} ${NPM_PROXY} install && \
  +RUN npm install && \
   	chown -R node:node ${NODE_HOME} && \
   	npm cache clean
   
  
positive.code: COPY package.json ${NODE_HOME}/
  
  RUN chown -R ${USER_NAME}:${USER_NAME} ${NODE_HOME}/package.json && \
  	npm ${NPM_LOGLEVEL} ${NPM_PROXY} install -g \
  				casperjs \
  				gulp \
  				phantomjs-prebuilt \
  
negative.code: FROM uwegerdes/nodejs
  
  MAINTAINER Uwe Gerdes <entwicklung@uwegerdes.de>
  
  USER root
  
  RUN apt-get update && \
  	apt-get dist-upgrade -y && \
  