Merge pull request #204 from denheck/master

Koans for Docker users

.dockerignore

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+lib/koans
+_build

Dockerfile

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+FROM elixir:1.5
+RUN apt-get update && apt-get install -y inotify-tools
+WORKDIR /elixir-koans
+ADD . /elixir-koans/
+RUN mix local.hex --force
+RUN mix deps.get
+CMD mix meditate

docker.sh

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+#!/bin/sh
+docker build -t elixir-koans . && docker run --rm -v `pwd`:/elixir-koans -ti elixir-koans