title: Javascript: sync to async converter libs
body: <p>1) What is better streamlinejs: <a href="https://github.com/Sage/streamlinejs" rel="nofollow">https://github.com/Sage/streamlinejs</a>
  or narrative: <a href="http://www.neilmix.com/narrativejs/" rel="nofollow">http://www.neilmix.com/narrativejs/</a> ? any others libs?</p>
  
  <p>2) How does any of those libraries even work?
  (I read the docs, I am looking for a simplify explanation of what's going on behind the scene..)</p>