anchor.diff:  ENV LANG en_US.UTF-8
   ENV LC_ALL en_US.UTF-8
   
  -RUN mkdir -p /opt/ruby && cd /opt/ruby && curl --progress ftp://ftp.ruby-lang.org/pub/ruby/ruby-2.0.0-p353.tar.gz | tar xz
  +# Install Ruby
  +RUN mkdir -p /opt/ruby && cd /opt/ruby && curl --progress ftp://ftp.ruby-lang.org/pub/ruby/2.1/ruby-2.1.1.tar.gz | tar xz
   RUN cd /opt/ruby/ruby* && ./configure && make && make install
   RUN echo "gem: --no-ri --no-rdoc" > /root/.gemrc
  -RUN gem install bundler
  +RUN gem install bundler rake
   
  +# Read an identity file
   RUN echo " IdentityFile ~/.ssh/id_rsa" >> /etc/ssh/ssh_config
  +
  +# Verify the correct host for Github
   RUN mkdir -p /root/.ssh
   RUN ssh-keyscan -t rsa,dsa github.com | sort -u > /root/.ssh/known_hosts
  
positive.code: FROM tianon/debian:wheezy
  MAINTAINER Nat Welch <nat@natwelch.com>
  
  ENV DEBIAN_FRONTEND noninteractive
  RUN echo 'deb http://gce_debian_mirror.storage.googleapis.com/ wheezy main contrib non-free' > /etc/apt/sources.list
  RUN apt-key update
  
negative.code: ADD packages.txt /tmp/
  RUN apt-get -qy install `cat /tmp/packages.txt`
  
  # Configure Language Environment
  RUN apt-get install -y locales
  ADD locale.gen /etc/locale.gen
  RUN locale-gen
  