Setup instructions

After cloning the repository and cd'ing into the dir...

# this command runs two commands in parallel via `concurrently`:
# `npm run server` starts up `webpack-dev-server` allowing for
# hot module reloading
# `npm` run watch` uses `webpack` to watch the necessary files
# and build on file change
$ npm start

# in a separate terminal:
# start `Express` server
$ gulp serve