anchor.diff:  
   # Install "software-properties-common" (for the "add-apt-repository")
   RUN apt-get update && apt-get install -y \
  -    software-properties-common
  +    software-properties-common \
  +    supervisor \
  +&& apt-get clean; rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* /usr/share/doc/*
   
   # Add the "PHP 7" ppa
   RUN add-apt-repository -y \
  
positive.code:         cron \
          git \
          curl \
          vim \
          nano \
          nodejs \
  
negative.code: RUN . ~/.bashrc
  
  # Clean up, to free some space
  RUN apt-get remove -y --purge software-properties-common \
      && apt-get -y autoremove \
      && apt-get clean \
      && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
  
  WORKDIR /var/www/site