title: dc.js TextFilterWidget is not defined
body: <p>I have installed dc.js (latest version 4.0.0) using npm for my node project and I have a simple table with a text filter component. It says the following error when I try to create new instance of the Textfilter passing the dimension </p>
  
  <p>This is the code used </p>
  
  <p><code>new TextFilterWidget('#search').dimension(tableDimension)</code></p>
  
  <p>Error Message </p>
  
  <blockquote>
    <p>Uncaught ReferenceError: TextFilterWidget is not defined</p>
  </blockquote>