Fast rebuilds.

lib/roles/app.js

@@ -45,7 +45,7 @@ module.exports = function(options) {
   app.use(webpackMiddleware(webpack( {
     cache: true,
     debug: true,
-    devtool: 'inline-source-map',
+    devtool: 'eval',
     entry: pathutil.resource('app') + '/entry.js',
     output: {
       path: '/static/build/',