anchor.diff:      python3-numpy \
       python3-pandas \
       python3-pil \
  -    python3-pip \
       python3-pytest \
       python3-tornado \
       python3-zmq
   
   # Install PIP packages for Azrael.
  -RUN pip3 install cytoolz setproctitle websocket-client==0.15 pymongo
  -
  -# Clone and compile the Boost-Python-Bullet wrapper.
   WORKDIR /tmp
  -RUN pip3 install \
  - -e git+https://github.com/Klumhru/boost-python-bullet.git#egg=boost-python-bullet
  +RUN apt-get install -y python3-pip && \
  +    pip3 install cytoolz setproctitle websocket-client==0.15 pymongo && \
  +    pip3 install --install-option -j \
  +    git+https://github.com/Klumhru/boost-python-bullet.git#egg=boost-python-bullet  && \
  +    apt-get remove -y python3-pip && \
  +    apt-get autoremove -y && apt-get -y clean
   
   # Clone Azrael from GitHub.
  -WORKDIR /demo
  -RUN git clone https://github.com/olitheolix/azrael
  -WORKDIR /demo/azrael
  +RUN git clone https://github.com/olitheolix/azrael /demo/azrael
   
   # Expose the webserver port.
   EXPOSE 8080
   
  -# Tell Docker not to track any changes in "/demo" directory (this is
  -# where MongoDB stores its files and where Azrael puts its logs).
  +# Export the /demo folder (this is where MongoDB stores its files and
  +# where Azrael puts its logs) to prevent Docker from tacking it via
  +# its Union FS.
   VOLUME /demo
   
  +WORKDIR /demo/azrael
  +
   ENTRYPOINT ["/usr/bin/python3", "entrypoint.py"]
  +#ENTRYPOINT ["/bin/bash"]
   
   # Default command: start MongoDB and Azrael.
   CMD ["-h"]
  
positive.code: # Clean Build: docker build --rm=true --no-cache=true -t="<user>/<name>:<tag>" .
  # Incremental Build: docker build -t="<user>/<name>:<tag>" .
  # Launch: docker run -p 8080:8080 -ti "<user>/<name>:<tag>"
  
  # Base image is Ubuntu 14.04
  FROM ubuntu:14.04
  
negative.code:          ' dist 10gen' | tee /etc/apt/sources.list.d/10gen.list
  
  # Install Ubuntu packages for Azrael.
  RUN apt-get update && apt-get install -y \
      IPython3 \
      git \
      libassimp-dev \
  