Configure project for heroku hosting

Create new folder in `public` where client files go called `client`.
Remove socket.io dependency from package.json and rename project to
`adventure-tone-build`. The app as built by coffee and brunch will be
the real `adventure-tone` package.
Add heroku port config

Add `process.env.PORT` as possible port. For local development, set port
to 8888 since heroku's method won't be defined.