Add Dockerfile to aid the use of the software

Dockerfile

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+# docker build -t neural-style .
+# mkdir /tmp/neural-style-host
+# docker run --rm -i -t -v /tmp/neural-style-host:/host neural-style
+# cd ~/neural-style
+# th neural_style.lua -gpu -1 -style_image examples/inputs/starry_night.jpg -content_image examples/inputs/hoovertowernight.jpg -num_iterations 500 -image_size 760 -output_image /host/out.png
+
+FROM ubuntu:15.10
+
+# install dependencies.
+RUN cd ~ && \
+	apt-get update && apt-get upgrade -y && \
+	apt-get install -y curl wget sudo libprotobuf-dev protobuf-compiler && \
+	curl -s https://raw.githubusercontent.com/torch/ezinstall/master/install-deps | bash && \
+	git clone https://github.com/torch/distro.git ~/torch --recursive && \
+	cd ~/torch && ./install.sh && . ~/.profile && \
+	luarocks install loadcaffe && \
+	apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
+
+# install neural-style from the local directory.
+ADD . /root/neural-style/
+RUN cd ~/neural-style && \
+	sh models/download_models.sh
+
+VOLUME ["/host"]