Add merge_images

Dockerfile

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+FROM debian:9-slim
+
+
+# Define image metadata
+LABEL maintainer="inf_sfb1288@lists.uni-bielefeld.de"
+
+
+ENV LANG=C.UTF-8
+
+
+# Install prerequisites
+RUN apt-get update \
+ && apt-get install -y --no-install-recommends \
+      imagemagick \
+      python3.5 \
+ && rm -rf /var/lib/apt/lists/*
+
+
+# Install merge_images
+COPY merge_images /usr/local/bin
+
+ENTRYPOINT ["merge_images"]
+CMD ["--help"]