Support firmware build using Docker

docker/Dockerfile

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+FROM debian:stable
+
+RUN apt-get update && \
+    apt-get install -y build-essential gcc-avr avr-libc git python2.7 && \
+    ln /usr/bin/python2.7 /usr/bin/python
+
+COPY p600fw-build.sh /bin/p600fw-build
+RUN chmod +x /bin/p600fw-build
+
+CMD [ "/bin/p600fw-build" ]

docker/README.md

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+p600fw-builder
+==============
+
+This directory contains a `Dockerfile` that you can use to build the 
+firmware for your Prophet 600 without having to install anything other
+than Docker.
+
+How-To
+------
+
+1. Clone this repo to your local system.
+2. Install Docker CE; at least version 17.06
+3. Follow instructions for your OS below to do the build and obtain the
+   firmware file.
+4. After completing the build, the file p600firmware.syx in the current
+   directory is a SysEx file containing the firmware. Follow the instructions
+   in the user guide to install it in your Prophet 600.
+
+### Mac OS X, Linux, other Unix-ish OS using Bash
+
+Run the following commands in your shell:
+```
+cd p600fw/docker
+docker image build -t p600fw-builder .
+id=$(docker container create p600fw-builder)
+docker container start -ai $id
+docker container cp $id:/dist/p600firmware.syx .
+docker container rm $id
+```
+
+### Windows
+
+> Hopefully someone who knows both Bash and the Windows shell can
+> translate the Bash instructions above and will submit a pull request 
+> to add the right instructions here.  :-)

docker/p600fw-build.sh

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+#!/bin/sh
+
+BRANCH=master
+REPO_URL=https://github.com/gligli/p600fw.git
+DIR=p600fw
+
+DIST=/dist
+FILES="p600firmware.bin p600firmware.hex p600firmware.syx"
+
+set -e
+set -x
+git clone $REPO_URL $DIR
+cd $DIR
+if [ "$BRANCH" != "master" ]; then
+  git checkout $BRANCH
+fi
+
+cd firmware
+make
+
+mkdir $DIST
+for f in $FILES; do
+  cp $f /dist/$f
+done