Move build folder inside lib

lib/webpack/base.config.js

@@ -3,7 +3,7 @@
 import vueLoaderConfig from './vue-loader.config'
 import { defaults } from 'lodash'
 import { join } from 'path'
-import { urlJoin } from '../../utils'
+import { urlJoin } from '../utils'
 
 /*
 |--------------------------------------------------------------------------

lib/webpack/server.config.js

@@ -39,7 +39,7 @@ export default function () {
   })
 
   // Externals
-  const nuxtPackageJson = require('../../../package.json')
+  const nuxtPackageJson = require('../../package.json')
   const projectPackageJsonPath = resolve(this.dir, 'package.json')
   config.externals = Object.keys(nuxtPackageJson.dependencies || {})
   if (existsSync(projectPackageJsonPath)) {