Add basic module integration

lib/module.js

@@ -0,0 +1,9 @@
+'use strict'
+
+class Module {
+  constructor (nuxt) {
+    this.nuxt = nuxt
+  }
+}
+
+export default Module

lib/nuxt.js

@@ -6,6 +6,7 @@ import compression from 'compression'
 import fs from 'fs-extra'
 import pify from 'pify'
 import Server from './server'
+import Module from './module'
 import * as build from './build'
 import * as render from './render'
 import generate from './generate'
@@ -111,6 +112,8 @@ class Nuxt {
     this.generate = generate.bind(this)
     // Add this.utils (tests purpose)
     this.utils = utils
+    // Add module integration
+    this.module = new Module(this)
     return this
   }