title: Element doesn't show
body: <p>I'm trying to use the color picker from element-ui (<a href="http://element.eleme.io/#/en-US/component/color-picker" rel="nofollow noreferrer">http://element.eleme.io/#/en-US/component/color-picker</a>). However it doesn't show up... Any clues about whats wrong?</p>
  
  <pre><code>&lt;template&gt;
    &lt;div class="color"&gt;
      &lt;span class="demonstration"&gt;Color picker&lt;/span&gt;
      &lt;el-color-picker v-model="color"&gt;&lt;/el-color-picker&gt;
    &lt;/div&gt;
  &lt;/template&gt;
  
  &lt;script&gt;
    import Vue from 'vue'
    import ColorPicker from 'element-ui'
    Vue.use(ColorPicker)
  
    export default {
      name: 'color',
      data () {
        return {
          color: '#20a0ff'
        }
      }
    }
  &lt;/script&gt;
  </code></pre>