refactor[core]: use webpack-dev-server now (#355)

* bump deps: update vue-splitpane version

* refactor[chore]: use webpack-dev-serve build

* perf:settings

* doc: uodate readme

build/build.js

@@ -1,39 +1,48 @@
-require('./check-versions')();
-var server = require('pushstate-server');
-var opn = require('opn')
-var ora = require('ora')
-var rm = require('rimraf')
-var path = require('path')
-var chalk = require('chalk')
-var webpack = require('webpack');
-var config = require('../config');
-var webpackConfig = require('./webpack.prod.conf');
+'use strict'
+require('./check-versions')()
 
-var spinner = ora('building for ' + process.env.NODE_ENV + ' of ' + process.env.env_config+ ' mode...' )
+const ora = require('ora')
+const rm = require('rimraf')
+const path = require('path')
+const chalk = require('chalk')
+const webpack = require('webpack')
+const config = require('../config')
+const webpackConfig = require('./webpack.prod.conf')
+const server = require('pushstate-server')
+
+var spinner = ora('building for '+ process.env.env_config+ ' environment...' )
 spinner.start()
 
-
 rm(path.join(config.build.assetsRoot, config.build.assetsSubDirectory), err => {
+  if (err) throw err
+  webpack(webpackConfig, (err, stats) => {
+    spinner.stop()
     if (err) throw err
-    webpack(webpackConfig, function (err, stats) {
-        spinner.stop()
-        if (err) throw err
-        process.stdout.write(stats.toString({
-                colors: true,
-                modules: false,
-                children: false,
-                chunks: false,
-                chunkModules: false
-            }) + '\n\n')
+    process.stdout.write(stats.toString({
+      colors: true,
+      modules: false,
+      children: false,
+      chunks: false,
+      chunkModules: false
+    }) + '\n\n')
 
-        console.log(chalk.cyan('  Build complete.\n'))
-        if(process.env.npm_config_preview){
-            server.start({
-                port: 9528,
-                directory: './dist',
-                file: '/index.html'
-            });
-            console.log('> Listening at ' +  'http://localhost:9528' + '\n')
-        }
-    })
+    if (stats.hasErrors()) {
+      console.log(chalk.red('  Build failed with errors.\n'))
+      process.exit(1)
+    }
+
+    console.log(chalk.cyan('  Build complete.\n'))
+    console.log(chalk.yellow(
+      '  Tip: built files are meant to be served over an HTTP server.\n' +
+      '  Opening index.html over file:// won\'t work.\n'
+    ))
+    if(process.env.npm_config_preview){
+      server.start({
+          port: 9526,
+          directory: './dist',
+          file: '/index.html'
+      });
+      console.log('> Listening at ' +  'http://localhost:9526' + '\n')
+    }
+  })
 })