anchor.diff: -FROM node:7.4-slim
  +FROM node:7.7-slim
   
   # Update container and install packages 
   RUN apt-get update 
  
positive.code: RUN git clone https://github.com/neurodata/neuroglancer.git 
  
  WORKDIR /usr/src/neuroglancer 
  RUN npm install 
  RUN npm link 
  
  
negative.code: RUN npm run build 
  RUN npm run grunt 
  
  CMD [ "npm", "start" ]
  
  EXPOSE 8000 
  