Add Dockerfile compatible with RPI Zero W / Raspbian Stretch

- Also adds variant with pytradfri installed, for easier use as base image for applications
- Fixes #116

DockerfileRPIW

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+FROM resin/rpi-raspbian:stretch
+
+# https://community.home-assistant.io/t/ikea-tradfri-gateway-zigbee-very-basic-working-implementation/14788/19?u=balloob
+RUN apt-get update -y && \
+  apt-get install -y python3 python3-dev python3-pip git autoconf automake libtool make && \
+  apt-get clean && \
+  rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* build/
+
+RUN mkdir -p /usr/src/app
+WORKDIR /usr/src/app
+
+COPY ./script/install-coap-client.sh install-coap-client.sh
+RUN ./install-coap-client.sh
+
+# Cython version must match the version used in DTLSSocket that's in requirements.txt
+RUN python3 -m pip install --upgrade pip setuptools wheel
+RUN python3 -m pip install Cython==0.27.2
+
+COPY requirements.txt requirements.txt
+RUN python3 -m pip install -r requirements.txt
+
+CMD /bin/bash

DockerfileRPIW-installed

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+FROM resin/rpi-raspbian:stretch
+
+# https://community.home-assistant.io/t/ikea-tradfri-gateway-zigbee-very-basic-working-implementation/14788/19?u=balloob
+RUN apt-get update -y && \
+  apt-get install -y python3 python3-dev python3-pip git autoconf automake libtool make && \
+  apt-get clean && \
+  rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* build/
+
+RUN mkdir -p /usr/src/app
+WORKDIR /usr/src/app
+
+COPY ./script/install-coap-client.sh install-coap-client.sh
+RUN ./install-coap-client.sh
+
+# Cython version must match the version used in DTLSSocket that's in requirements.txt
+RUN python3 -m pip install --upgrade pip setuptools wheel
+RUN python3 -m pip install Cython==0.27.2
+
+COPY requirements.txt requirements.txt
+RUN python3 -m pip install -r requirements.txt
+
+COPY ./ /usr/src/app/pytradfri/
+RUN cd pytradfri && python3 setup.py install
+
+CMD /bin/bash