anchor.diff:  # RUN ...
   RUN apt-get install -y pylint zip
   RUN sudo a2enmod rewrite
  -RUN curl -sS https://getcomposer.org/installer | php
  -RUN mv composer.phar /usr/bin/composer
  -RUN apt-get install -y php5-mcrypt
  -RUN apt-get install -y python3-pip
  -RUN sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv 7F0CEB10 && \
  -    echo "deb http://downloads-distro.mongodb.org/repo/ubuntu-upstart dist 10gen" | sudo tee /etc/apt/sources.list.d/mongodb.list && \
  -    sudo apt-get update && \
  -    sudo apt-get install -y mongodb-org
   
   # setup the system
   RUN echo -n "" > /etc/motd && \
  
positive.code: # servers
  RUN apt-get install -y redis-server redis-tools nginx postgresql-9.3 phppgadmin
  RUN apt-get install -y mysql-server phpmyadmin rabbitmq-server couchdb
  RUN apt-get install -y apache2 php5 php5-fpm apache2-doc php-pear
  
  # tools
  RUN apt-get install -y dnsutils bash-completion xsltproc \
  
negative.code: 
  # Python
  RUN apt-get install -y python3 python3-dev python3-setuptools ipython3 \
      python3-scipy python3-pip python python-dev python-pip python-setuptools ipython \
      python-scipy python-matplotlib python-virtualenv virtualenvwrapper
  
  # Julia
  