Dockerfile from 18F/micropurchase

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FROM ruby:2.3.3
RUN apt-get update -qq && apt-get install -y \
  build-essential \
  libpq-dev \
  nodejs \
  nodejs-legacy \
  npm \
  graphviz
RUN npm install -g phantomjs-prebuilt
RUN mkdir /app
WORKDIR /app
ADD Gemfile /app/Gemfile
ADD Gemfile.lock /app/Gemfile.lock
RUN bundle install
RUN gem install foreman
RUN gem install travis
RUN curl https://raw.githubusercontent.com/vishnubob/wait-for-it/master/wait-for-it.sh > /usr/local/bin/wait-for-it
RUN chmod +x /usr/local/bin/wait-for-it
CMD wait-for-it db:5432 && bundle exec rake dev:prime && \
  foreman start