title: Vuetify options not taken into account in vue-cli library build
body: <p>My app is correctly wrapped with <code>&lt;v-app&gt;</code> and my vuetify options work fine in development mode or if I build normally using <code>vue-cli-service build</code> for example.</p>
  
  <pre><code>Vue.use(Vuetify, {
    iconfont: 'fa',
    theme: {
      primary: '#213e79',
      secondary: '#c0d8ed', 
      accent: '#4ea3ed',
      error: '#b71c1c',
      info: '#2196f3',
      success: '#66bb6a', 
      warning: '#f57f17'
    }
  });
  </code></pre>
  
  <p>However, if I build in <strong>library mode</strong> (ex: <code>vue-cli-service build --target lib --name xxx</code>), the above options are <strong>NOT</strong> taken into account. I'm forced to modify <code>vuetify/dist/vuetify.js</code> for lack of a better solution.. </p>
  
  <p>Any idea what could be the issue ? If any of you has a workaround laying around, that would be great :)</p>