message: Ensure authentication
diff: express = require 'express'
  routes = require './routes'
  +ensureLoggedIn = require '../../lib/middleware/ensure_logged_in'
  app = module.exports = express()
  app.set 'views', __dirname + '/templates'
  app.set 'view engine', 'jade'
  -# TODO: Check if logged in
  -app.get '/welcome', routes.index
  -app.get '/welcome/:scene', routes.index
  -app.get '/welcome/find-friends/callback', routes.findFriendsCallback
  +app.get '/welcome', ensureLoggedIn, routes.index
  +app.get '/welcome/:scene', ensureLoggedIn, routes.index
  +app.get '/welcome/find-friends/callback', ensureLoggedIn, routes.findFriendsCallback
  