title: ES6 imports - what does the exclamation mark mean?
body: <p>I'm following along with the <a href="http://developer.telerik.com/featured/choose-es6-modules-today/">Choose ES6 Modules Today</a> guide, and I noticed one of the import statements he's using has an exclamation mark at the end:</p>
  
  <p><code>import 'bootstrap/css/bootstrap.css!';</code></p>
  
  <p>What does that exclamation mark signify?</p>
  
  <p>This import statement appears on the first line of the <a href="https://github.com/codylindley/jspm-startup/blob/master/src/startup.js">startup.js</a> file.</p>