title: bluebird.js vs bluebird.core.js what is the difference?
body: <p>What is the difference between bluebird.js and bluebird.core.js? </p>
  
  <p>When should I use bluebird.core.js instead of bluebird.js? </p>
  
  <p>I haven't been able to find anything in the <a href="http://bluebirdjs.com/docs/getting-started.html">bluebird site</a> or elsewhere.</p>