anchor.diff:  	apt-get install --force-yes -y \
           # Install fonts + firefox for headless testing in selenium
           xvfb \
  -        firefox \
           xfonts-100dpi \
           xfonts-75dpi \
           xfonts-scalable \
  
positive.code: 
  # cleanup
  RUN apt-get clean
  
negative.code: FROM selenium/node-firefox as firefox
  FROM derekadair/python-workflow:onbuild
  MAINTAINER Derek Adair "d@derekadair.com"
  # Add packages for firefox to list
  