title: how to import material ui icons?i met some problems using Material ui icons
body: <p>I was using material UI with react in my project,and i have some troubles when it come to import the material icons,my code is copied from the material UI (version:"material-ui": "^1.0.0-beta.41",
      "material-ui-icons": "^1.0.0-beta.36",)
  docs ,just like this:</p>
  
  <pre><code>import SkipPreviousIcon from '@material-ui/icons/SkipPrevious';
  import PlayArrowIcon from '@material-ui/icons/PlayArrow';
  import SkipNextIcon from '@material-ui/icons/SkipNext';
  </code></pre>
  
  <p>and also i have run npm install material-icons.
  the error in my chrome console is:</p>
  
  <blockquote>
    <p>./src/index/musicCard.js Module not found: Can't resolve
    '@material-ui/icons/PlayArrow' in
    'C:\Users\wenji\Desktop\myblog\src\index'
    and I tried this one:</p>
  </blockquote>
  
  <pre><code>import SkipPreviousIcon from 'material-ui/icons/SkipPrevious';
  </code></pre>
  
  <p>and this one:</p>
  
  <pre><code>import SkipPreviousIcon from '@material-ui-icons/SkipPrevious';
  </code></pre>
  
  <p>but dose not make any difference,so can anyone help me ?</p>