title: how to include yaffle event source polyfill
body: <p><a href="https://github.com/Yaffle/EventSource" rel="nofollow">https://github.com/Yaffle/EventSource</a></p>
  
  <p>I used the above because I want to get promises to work in IE11, I have installed it with npm but not sure how I'm suppose to implement it. I tried <code>import event-source-polyfill</code> in my js file but that hasn't worked either. The doc says just to run build, but what is the purpose of that if I already see the min.js file int he node_modules/event-source-polyfill directory? How do actually include it?</p>