title: Passing className prop to Material-ui child/inner elements
body: <p>Is it possible to assign a css class to the inner elements of a Material-UI component. Using the <code>&lt;RaisedButton /&gt;</code> component as an example, lets say that I want to apply a className to the label element within Raised Button. </p>
  
  <p><code>&lt;RaisedButton labelStyle={{...}}</code>. </p>
  
  <p>Since <code>labelStyle</code> is looking for an object, how would I apply a custom css class rather than adding inline code?</p>