Adding Jekyll container which includes very basic starter content

jekyll-github-pages/Dockerfile

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+FROM ubuntu:trusty
+
+MAINTAINER itzg
+
+RUN apt-get update
+RUN apt-get -y upgrade
+
+RUN apt-get -y install ruby ruby-dev make patch
+RUN gem install bundler
+
+ADD Gemfile /tmp/Gemfile
+WORKDIR /tmp
+RUN bundle install
+
+ADD template /site-template
+
+VOLUME ["/site"]
+EXPOSE 4000
+
+ADD start.sh /start
+CMD ["/start"]
+