Add Dockerfile and docker-compose config

.dockerignore

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+tmp
+log
+.vagrant
+.git
+coverage

Dockerfile

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+FROM ruby:2.2
+RUN apt-get update && apt-get install -y build-essential zlib1g-dev libsqlite3-dev nodejs nodejs-legacy
+
+RUN mkdir -p /app
+
+WORKDIR /tmp
+COPY Gemfile Gemfile
+COPY Gemfile.lock Gemfile.lock
+RUN bundle install
+
+ADD . /app
+WORKDIR /app
+
+EXPOSE 3000
+CMD ["rails", "server", "-b", "0.0.0.0"]

docker-compose.yml

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+web:
+  build: .
+  volumes:
+    - .:/app
+  ports:
+    - "3000:3000"
+  links:
+    - elasticsearch
+  environment:
+    ELASTICSEARCH_URL: 'http://elasticsearch:9200'
+elasticsearch:
+  image: elasticsearch:1.7