Adding cookie to allow client authentication.

server.coffee

express = require 'express'
config = require 'config'

app = express()

app.configure ->
  app.use '/static/', express.static config.static_root path.join __dirname, '/../client/build'
  app.use '/static/', (req, res, next) ->
    # We're requesting a non-existent static resource.
    res.send 404

# Your routes...

# Default route.
app.get '/*', (req, res) ->
  res.cookie 'user', JSON.stringify(req.user?.doc) or null
  res.render 'index.html'