Docker support

Dockerfile

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+FROM node:slim
+# WORKDIR specifies the directory our
+# application's code will live within
+WORKDIR /app
+# We copy our package.json file to our
+# app directory
+COPY package.json /app
+# We then run npm install to install
+# express for our application
+RUN npm install
+# We then copy the rest of our application
+# to the app direcoty
+COPY . /app
+# We start our application by calling
+# npm start.
+CMD ["npm", "start"]