Added Dockersupport. See README_DOCKER.md for further instructions.

Dockerfile

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+FROM ruby:2.1-slim
+
+RUN apt-get update && \
+    apt-get install --no-install-recommends -y \
+      mysql-client \
+      git \
+      make \
+      gcc \
+      g++ \
+      patch \
+      libsqlite3-dev \
+      libv8-dev \
+      libmysqlclient-dev \
+      libxml2-dev \
+      libxslt1-dev \
+      libffi-dev \
+      libreadline-dev \
+      xvfb \
+      iceweasel && \
+    rm -rf /var/lib/apt/lists/* && \
+    apt-get clean
+
+ENV WORKDIR /usr/src/app
+
+RUN mkdir -p $WORKDIR
+WORKDIR $WORKDIR
+
+# Copy plugins before the rest to allow bundler loading gemspecs
+# TODO: Move plugins to gems and add them to Gemfile instead
+COPY plugins $WORKDIR/plugins
+
+COPY Gemfile $WORKDIR/
+COPY Gemfile.lock $WORKDIR/
+RUN bundle install --jobs 4
+
+COPY . $WORKDIR
+
+EXPOSE 3000
+
+CMD ["rails", "server"]