expose buildDir to webserver in same manner as its done for pipeline

lib/core/engine.js

@@ -228,6 +228,7 @@ class Engine {
   }
 
   webServerService(_options) {
+    _options.buildDir = this.config.buildDir;
     this.registerModule('webserver', _options);
   }
 

lib/modules/webserver/index.js

@@ -8,6 +8,7 @@ class WebServer {
     this.embark = embark;
     this.logger = embark.logger;
     this.events = embark.events;
+    this.buildDir = options.buildDir;
     this.webServerConfig = embark.config.webServerConfig;
     if (!this.webServerConfig.enabled) {
       return;
@@ -19,6 +20,7 @@ class WebServer {
     this.events.emit("status", __("Starting Server"));
 
     this.server = new Server({host: this.host, port: this.port});
+      buildDir: this.buildDir,
     this.testPort(() => {
       this.listenToCommands();
       this.registerConsoleCommands();

lib/modules/webserver/server.js

@@ -12,7 +12,7 @@ const embark_building_placeholder = require('../code_generator/code_templates/em
 
 class Server {
   constructor(options) {
-    this.dist = options.dist || 'dist/';
+    this.buildDir = options.buildDir;
     this.port = options.port || 8000;
     this.hostname = dockerHostSwap(options.host) || defaultHost;
     this.isFirstStart = true;
@@ -26,7 +26,7 @@ class Server {
                       ":" + this.port).bold.underline.green;
       return callback(null, message);
     }
-    let serve = serveStatic(this.dist, {'index': ['index.html', 'index.htm']});
+    let serve = serveStatic(this.buildDir, {'index': ['index.html', 'index.htm']});
 
     this.server = http.createServer(function onRequest(req, res) {
       serve(req, res, finalhandler(req, res));