Automatically use prebuild resources if available.

lib/units/app/index.js

@@ -1,5 +1,6 @@
 var http = require('http')
 var url = require('url')
+var fs = require('fs')
 
 var express = require('express')
 var validator = require('express-validator')
@@ -40,7 +41,8 @@ module.exports = function(options) {
   app.set('case sensitive routing', true)
   app.set('trust proxy', true)
 
-  if (options.disableWatch) {
+  if (fs.existsSync(pathutil.resource('build'))) {
+    log.info('Using pre-built resources')
     app.use(compression())
     app.use('/static/app/build/entry',
       serveStatic(pathutil.resource('build/entry')))
@@ -49,6 +51,7 @@ module.exports = function(options) {
     }))
   }
   else {
+    log.info('Using webpack')
     app.use('/static/app/build',
       require('./middleware/webpack')(webpackServerConfig))
   }