修改npm run build 为 npm run build-example，修复配置路径错误问题

Author: leezng

build/webpack.prod.conf.js

@@ -55,7 +55,7 @@ var webpackConfig = merge(baseWebpackConfig, {
       filename: process.env.NODE_ENV === 'testing'
         ? 'index.html'
         : config.build.index,
-      template: 'index.html',
+      template: 'example/index.html',
       inject: true,
       minify: {
         removeComments: true,

package.json

@@ -6,7 +6,7 @@
   "private": true,
   "scripts": {
     "dev": "node build/dev-server.js",
-    "build": "node build/build.js",
+    "build-example": "node build/build.js",
     "e2e": "node test/e2e/runner.js",
     "test": "npm run e2e",
     "lint": "eslint --ext .js,.vue src test/e2e/specs"