Merge pull request #10 from actuino/unicorn-dev3

Python 2 dev image for the Unicorn HAT or pHAT

images/armhf/python2-unicornhat.dev/Dockerfile

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+FROM alexellis2/python2-armhf:2
+ENTRYPOINT []
+RUN apt-get -qy update && apt-get -qy --no-install-recommends install git python-dev python-pip build-essential
+WORKDIR /root/
+RUN git clone https://github.com/pimoroni/unicorn-hat
+# But install via pip
+RUN  pip install unicornhat &&  \
+  rm -rf /var/lib/apt/lists/* && \
+  apt-get -qy clean all
+
+WORKDIR /root/unicorn-hat/examples/
+
+CMD ["/bin/bash"]

images/armhf/python2-unicornhat.dev/Makefile

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+NS = alexellis2
+VERSION ?= 2-dev
+REPO = python2-unicornhat-armhf
+
+.PHONY: build push shell run start stop rm release
+
+build:
+	docker build -t $(NS)/$(REPO):$(VERSION) .
+push:
+	docker push $(NS)/$(REPO):$(VERSION)
+
+default: build
+

images/armhf/python2-unicornhat.dev/README.md

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+Unicorn HAT
+================================================
+
+This image includes a full Python 2.7 dev stack, with `pip` as well as `git` and `build-essentials`. (not optimised for size)
+
+The Pimoroni library for Unicorn HAT and pHAT is installed.
+
+This image has to be run with the `--privileged` option like so:
+
+    docker run -it --privileged alexellis2/python2-unicornhat-dev:2 
+
+The library can auto-detect if you're using a Unicorn HAT or a Unicorn pHAT.
+
+The default dir is the examples one, so you can test drive the demos, for instance:
+
+	python rainbow.py
+
+See the full [examples listing](https://github.com/pimoroni/unicorn-hat/tree/master/examples)
+
+Note that some examples require extra Python libs that were not included (Numpy is one)
+
+About the Unicorn HAT and pHAT
+------------------------------
+The Unicorn is a Raspberry Pi add on that provides a nice array of (very bright) RGB LEDs.
+Those are individually addressable WS2812B LEDs.
+
+It's made by [Pimoroni](https://shop.pimoroni.com) and comes in two flavors:
+
+* The [Unicorn pHAT](http://shop.pimoroni.com/products/unicorn-phat) I used, 8x4 LEDs, will nicely fit your Raspberry Pi Zero
+* The [Unicorn HAT](http://shop.pimoroni.com/products/unicorn-hat) is dedicated to the bigger Raspberry Pi 2 and 3, and comes with 8x8 LEDs