Added Dockerfile

Dockerfile

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+
+FROM ruby:2.2.2
+MAINTAINER Conor Heine <conor.heine@gmail.com>
+
+RUN apt-get update
+RUN apt-get -y install git nodejs
+RUN git clone https://github.com/Thibaut/devdocs.git /devdocs
+RUN gem install bundler
+
+WORKDIR /devdocs
+
+RUN bundle install --system
+RUN thor docs:download --all
+
+EXPOSE 9292
+CMD rackup -o 0.0.0.0
+